Stringing and oozing

Stringing or oozing, also known as "hairy prints", is the name given for when small strings of filament are left on a printed model. This usually happens when the filament keeps…

First layer issues

This is by far the most common 3D printing problem, and probably the first one you may encounter. The first layer is the essential one because it is the base of the printed object.…

The Benchy hull line

The 3DBenchy is a 3D model designed by CreativeTools specifically for testing and benchmarking 3D printers. And everyone wants to know, how to print a perfect Benchy. Ever since…

Clogged nozzle/hotend (MK3.5/S, MK3S+, MK2.5S)

A 3D printer's hotend can get clogged. This article explains the most common causes of this issue, which are usually the same regardless of the printer type or model. We then have…

MINTEMP error and MINTEMP BED

The MINTEMP error (written sometimes as min temp) occurs when the temperature readout from the heatbed thermistor or hotend thermistor drops below a certain amount within a certain…

Layer shifting

Layer shifting is a printing issue that causes the layers of the printed object to shift from their intended positions. It is usually associated with an abnormal movement of the…

SD cards and USB drives

As there are ways of remotely transferring files and starting prints, an SD card or USB flash drive is the most common and reliable way to get your files to your machine. Though…

Extruder noises

Filament grinding, which is accompanied by a “clicking” or "squeaking " sound coming from the extruder, usually happens when the extruder gears are unable to push the filament…

Extrusion stopped mid-print (Heat creep)

If your printer suddenly stops extruding filament, yet continues the print moves without reporting any error, you may be a victim of a heat creep. What does it look like Broadly…

Under-extrusion

You can recognize under extrusion when there is material missing in your print’s layers. Printed objects with under extruded layers can be fragile and tend to break apart. There…

P.I.N.D.A./SuperPINDA Sensor testing

P.I.N.D.A. stands for Prusa INDuction Autoleveling sensor and is a vital component facilitating the calibration of our printers. There are 3 different versions: P.I.N.D.A. V1…

Extruder blob

The blob (mass of plastic accumulated around the hotend) is one of the most scary-looking printing problems you might face with your 3D printer. Removing it after it happens is…

Squaring your MINI

During transport, assembly, or maintenance (like adjusting the belt tension) the printer can become slightly skewed, where one axis may not be perpendicular (90-degree angle) to…

Clogged nozzle/hotend (MINI/MINI+)

A clogged nozzle or hotend is a common issue for the FFF/FDM printers. If there are no issues, the filament is pushed in the hotend, melted, and then extruded through the nozzle.…

IR Filament Sensor Troubleshooting (MK2.5S, MK3S)

The IR sensor is a hybrid solution that combines an IR laser sensor triggered by a tiny mechanical lever. This means that in case one of the functions of the IR sensor is not working,…

Thermal Runaway (i3 series)

Thermal Runaway is a safety feature designed to cut power to the heaters in case of a thermistor malfunction. If your printer's thermistor would somehow dislodge itself, electronic…

Multimeter usage

In many cases, we need to decide whether a component is faulty or just wrongly installed. There are also situations where we need to decide exactly which component should be replaced.…

Warping

When printing large objects, you can sometimes run into an issue with the corners of the object being lifted from the bed – mostly when printing with high-temperature materials…

Firmware updating issues (MK2.5S/MK3S+/MMU2S/MMU3)

Flashing the firmware can sometimes fail, but most of the time it is nothing major. Before going deeper into issues related to flashing your printer, there are some initial steps…

Poor bridging

Bridging is a term for printing layers over thin air without the use of supports. It may sound like an impossible feat, but with our printers, it’s not that difficult. Keep in…

Filament Not Loading

If the filament is not loaded into the extruder, yet the printer is trying to pull the filament inside. It is usually a simple hardware problem, which we will fix in this article.  Ideal…

Print doesn't appear / Resin does not solidify

If the print does not appear on the printing platform, nor at the bottom of the resin tank, there are a couple of possible causes: Highly insufficient exposure times Old or separated…

Err: PRINT FAN ERROR

PRINT FAN ERROR error message occurs when the print fan (the one at the front of the extruder) does not receive any RPM (Revolutions per Minute) readings. This can be caused by…

Clogged nozzle (CORE One, CORE One L, XL, MK4/S, MK3.9/S)

A clogged nozzle is a possible issue for FFF/FDM printers. If there are no issues, the filament is pushed into the hotend, melted, and then extruded through the nozzle. However,…

IR filament sensor calibration (MMU3, MMU2S)

If you have the Original Prusa MMU2S or MMU3 installed in the MK3S/+ or MK3.5, the IR filament sensor needs to be calibrated before first use, in order to work properly. The calibration…

Factory reset (MK2S/MK2.5S/MK3S)

A factory reset can be used during troubleshooting to wipe configuration, calibration, and statistics data from your printer's memory. There are two ways how to perform a factory…

Layer separation and splitting FDM

This refers to the de-lamination of the printed layers. It is mostly caused by an incorrect preset/(custom)profile with wrong temperatures and/or too much cooling from either the…

Bad looking surface above supports

Generally speaking, it’s always the best option to rotate the object in such a way that the supports are not needed at all. However, if you need to print complex objects, you will…

Bed leveling failed

The Bed leveling failed error appears when there is something wrong with the last stage of the calibration. This calibration is the last step of XYZ calibration and is performed…

MMU2S LEDs meaning

As you can see, there are five main LEDs on the MMU2 unit. Their arrangement corresponds to the arrangement of the 5 PTFE tubes and 5 filament channels. Each LED consists of two…

Blown Fuse (MK3/MK3S/MK3S+)

The Original Prusa i3 MK3 series printers are equipped with fuses to protect their crucial components. If your printer or some of its components suddenly stopped working, it is…

Preheat error

The Preheat error message occurs when there is a problem with the preheat process before your print starts. Therefore, there is something preventing the printer from heating up…

Watertight prints

A print coming from molten plastic one might assume that it is water-tight, but that is not always the case. How to make an object look good and what makes it watertight does not…

Ghosting

Ghosting can be typically recognized by several waves that follow after a sharp edge of a model. An example can be seen in the photograph of 3DBenchy at the marked spot. How to…

Mintemp error bed #12207 (MINI)

What happened? The printer will display "Mintemp error" for the heatbed if the printer's heatbed temperature goes below 15 ºC at any point. In this case, the printer will stop…

Nextruder filament sensor (CORE One, CORE One L, MK4/S, MK3.9/S, XL/+)

The filament sensor equipped on our Nextruder printers detects the presence of a filament and filament run-out. The sensor is a Hall sensor, triggered by a mechanism composed of…

Filament failed to unload (MINI/MINI+)

When unloading the filament, the tip can have a large or irregular shape that is too big for the Bowden PTFE tube. You may hear some grinding sounds from the extruder as the printer…

Spaghetti monster

Why the name spaghetti monster? This print issue looks exactly like it sounds, a big mess of "spaghetti" on and around your print. It is actually extruded filament, which was misplaced…

SD card not working

Our Original Prusa i3 printers offer two ways of printing: via a USB cable or by loading g-codes from an SD card. If you are experiencing SD-card-related issues, try some of our…

MK3S keeps prompting filament change

With the Original Prusa MK3S (and the Original Prusa MK2.5S upgrade), we are introducing a completely reworked extruder with a new filament sensing system. It is a hybrid solution,…

Failing Z calibration (MK3S/MK2.5S)

The size of the extruder and the length of travel of the Z-axis is coded into the firmware. Therefore, if the assembly of the extruder, or the firmware for your extruder, is not…

Heatbed not heating up properly

If your Heatbed does not heat up, there are a couple of things you should check to identify the source of the issue. Temperature measurements Measuring the temperature with an…

Print fan is not spinning

The print fan is the fan blowing on the printed object, right below the nozzle. Depending on the material and where you are in the print it might not always spin at full speed…

MMU loading failed

If you see the error message “MMU load failed” on the printer’s LCD display, it indicates that the filament went through the Original Prusa MMU2S unit (registered by the F.I.N.D.A.…

FINDA setup and troubleshooting

The FINDA sensor, sometimes referred to as F.I.N.D.A. is essentially the MK2/S PINDA sensor (without thermistor), upcycled to be used as a filament sensor. It is triggered by the…

Connect Registration Failed

What happened?  During the configuration of Prusa Connect on the Original Prusa MINI/+, MK4/S, MK3.9/S, MK3.5/S or XL an error on this configuration can occur and the printer shows…

LCD screen not working

The LCD screen is vital for operating the printer. Should you encounter any kind of trouble, such as a dead screen, corrupted text, or other issues, please refer to the guide below.  First…

MAXTEMP

The MAXTEMP error occurs when at least one of the temperature readouts of the hotend is higher than 305 °C. It is a safety feature that prevents the printer from overheating uncontrollably. The…

Nozzle crashed into the heatbed

If this occurs it indicates a problem with the P.I.N.D.A. or SuperPINDA sensor. P.I.N.D.A. stands for Prusa INDuction Auto leveling. It is the Z-axis end-stop on the MK2/S and…

Please open idler and remove filament manually

The message on your LCD saying  Please open idler and remove filament manually shows up when the extruder motor does not succeed to remove the filament from the hotend/extruder.…

Vibration when printing (MK3S+/MK2.5S)

Your Original Prusa MK3S+/MK3S/MK3 printer may be causing some vibrations during use. In most cases, this will not cause any printing issues, however, we will show you how to minimize…

MMU needs user attention

If your MMU2S print encounters an issue it will stop mid-print and one or more of the LEDs will be blinking red. The following message will be displayed on the LCD: “MMU needs…

Stuck filament detection #31101 (CORE One) #35101 (CORE One L) #26101 (MK4S) #13101 (MK4) #27101 (MK3.9S) #21101 (MK3.9) #17108 (XL)

The Prusa CORE One, CORE One L, and the Original Prusa XL, MK4/S, MK3.9/S are equipped with a loadcell. Thanks to this component, starting from firmware 6.0.0, the printer can…

Err: EXTR. FAN ERROR

The EXTR. FAN ERROR message appears when the extruder fan does not receive any RPM (Revolutions per Minute) readings, in other words, there is something preventing it from spinning.…

Failing supports

Supports are an important part of a 3D-printed object, especially when printing a model with a complex shape. If support material breaks, it is likely to cause a failure on the…

PrusaLink Troubleshooting

This guide will help you solve the most common issues with the PrusaLink and Prusa Connect on your Original Prusa Printer. Original Prusa MK4/S, MK3.9/S, MK3.5/S, XL, MINI/+ Wi-Fi…

M.I.N.D.A./SuperPINDA sensor testing (MINI/MINI+)

The Induction auto-leveling sensor is a vital component facilitating the calibration of the MINI and MINI+. It acts like the Z end-stop and is the main component in mesh-bed leveling.…

Connect Registration Failed #31401 (CORE One) #35401 (CORE One L) #36401 (CORE One INDX) #17401 (XL) #26401 (MK4S) #13401 (MK4) #27401 (MK3.9S) #21401 (MK3.9) #28401 (MK3.5S) #23401 (MK3.5) #12401 (MINI)

What happened?  During the configuration of Prusa Connect on the Original Prusa Printers, an error can occur, and the printer shows the message "Registration to Prusa Connect failed…

Firmware in the internal flash corrupted! #12608 (MINI)

What happened? While flashing firmware to your printer an error might occur, and the screen will display the following message: "Firmware in the internal flash corrupted!". The…

Printer does not turn on or keeps turning off

If your printer doesn't turn on, keeps turning off, or is stuck in a boot loop, see here how to fix the issue. The printer must be powered off and disconnected from power when…

Hotend fan is not spinning

This issue can be preceded by the error Err: EXTR. FAN ERROR. Before we start checking your Hotend fan, power down and unplug your USB cable if it's connected. Open the electronics…

Thermal runaway print head #12204 (MINI)

What happened? The printer will display "Thermal runaway" for the print head if the printer drops the print head temperature by 6 ºC for a long period of time. This temperature…

Preheat error (Heatbed)

Preheat error can happen with either with your Nozzle or Heated bed. So 1st make sure with which of these you have the problem. "Heatbed preheat error" (Heatbed) Things to check: Make…

Factory reset (MMU2S pre firmware 1.0.6)

As the MMU unit has its own separate logic board, it also has its separate firmware that is cooperating with the printer firmware. This MMU-specific firmware is flashed directly…

Watchdog reset MINI

The "WATCHDOG reset" error message can appear on the display of the Original Prusa MINI if the system freezes or an operation crashes, for more than 4 seconds. This is a global…

Preheat error print head #12202 (MINI)

What happened? The message "Preheat error print head" is shown when the printer is unable to heat up the hotend more than 2 ºC for 20 seconds. The printer starts a safety feature,…

Broken supports (SL1/SL1S)

Broken supports (or missing parts of supports) are usually caused by incorrect settings in the PrusaSlicer. The supports are either too thin or the exposure time is set to a value…

IR Filament Sensor Troubleshooting (MINI/MINI+)

When purchasing the Original Prusa MINI+, kit or semi-assembled, there is an option to add a filament sensor to the printer. It can also be purchased separately later. This sensor…

Mintemp error print head #12208 (MINI)

What happened? The printer will display "Mintemp error" for the print head if the printer's hotend temperature goes below 15 ºC at any point. In this case, the printer will stop…

File incomplete. Continue anyway?

Our printers can detect a corrupted file on the SD card. The error message "File incomplete. Continue anyway?" occurs when there is a problem with the generated G-code and it could…

MMU MCU Error #04306 (MMU)

What happened? The Main Control Unit on the MMU control board has detected a power-related issue. How to fix it? Do not touch, move, connect, or disconnect any cables or electronic…

FINDA: Filament Stuck #04102 (MMU)

What happened? While the MMU unit was unloading a filament, the SuperFINDA sensor inside the selector stayed triggered/detecting a filament, while it shouldn’t.  The superFINDA…

Filament not loading (MK4/S, MK3.9/S)

If the filament is not loaded into the extruder, yet the printer is trying to pull the filament inside, there might be a hardware problem in some of the extruder components: we…

Load to extruder failed #04108 (MMU)

What happened? While loading into the extruder, the printer performs an automatic loading check as soon as the filament sensor detects a filament. If the check fails, this error…

Misaligned PINDA Sensor (MK2/S)

A misaligned P.I.N.D.A. Sensor is an issue that can be fixed by fine-tuning the printer. To do that, you need to calibrate the P.I.N.D.A. sensor position on multiple spots around…

Problems with infill

Various problems with infill are not the worst kind of trouble you may come across, however, in some cases it can put the structural integrity of your prints at risk. The ideal…

Homing error X #26304 (MK4S) #13304 (MK4) #27304 (MK3.9S) #21304 (MK3.9) #28304 (MK3.5S) #23304 (MK3.5)

What happened? The Original Prusa MK4/S, MK3.9/S, MK3.5/S displays the message: "Failed to home the extruder in X-axis, make sure there is no obstacle on X-axis". Error name: Homing…

First layer does not stick (SL1/SL1S)

If there is no object to be seen on the metal platform as it raises from the resin tank, it usually means that the first layer didn’t adhere properly to the platform. Let’s find…

Idler cannot home #04125 (MMU)

What happened? Before it can align with any of the filament positions, the Idler inside the MMU unit needs to be “homed” to determine its position. First, the Idler moves to one…

MMU2S Selector not moving

If the selector of your MMU2S upgrade is not moving smoothly, or if it cannot reach a certain position, the cause is usually one of the following issues: The selector blade is…

Factory reset (CORE One L, CORE One, MK4/S, MK3.9/S, MK3.5/S, MINI/+, XL)

During normal function, your printer saves statistics, calibration data, and personalized settings, even after it is turned off. If you feel like you changed settings that have…

Clogged hotend (XL)

A clogged nozzle or hotend is a common issue for FFF/FDM printers. If there are no issues, the filament is pushed in the hotend, melted, and then extruded through the nozzle. However,…

Preheat error bed #12201 (MINI)

What happened? A printer displaying the message "Preheat error bed" encountered an error while heating up the heatbed. If the heatbed temperature does not increase more than 2…

MMU2S idler unable to move freely

If your Original Prusa Multi Material idler barrel has some issues moving, makes clicking noises, or gives the error #04125 Idler cannot home, something is preventing the full…

Blown Fuse (MK2S/MK2.5/MK2.5S)

The Original Prusa i3 MK2 series printer is equipped with fuses to protect the most important peripheries. If your printer or some of its components suddenly stopped working, it…

TMC driver overtemp

This error refers to the TrinaMiC motor-drivers on the Einsy Rambo-board. They are the square chips located near the ports for the X, Y, Z, and E-motors on the Einsy RAMBo (Circled…

Print detached from supports (SL1/SL1S)

Why is this happening?  If the printed object detaches from its supports mid-print, it will fall into the resin tank, usually with the supports still attached to the printing platform.…

Hotend preheat error #31202 (CORE One) #35202 (CORE One L) #26202 (MK4S) #13202 (MK4) #27202 (MK3.9S) #21202 (MK3.9) 

What happened? The printer is showing the message "Hotend preheat error: Check the print head heater and thermistor wiring for potential damage" Error name: Hotend preheat error Error…

Bed preheat error #31201 (CORE One) #35201 (CORE One L) #36201 (CORE One INDX) #26201 (MK4S) #13201 (MK4) #27201 (MK3.9S) #21201 (MK3.9) #28201 (MK3.5S) #23201 (MK3.5) 

What happened? The printer is showing the message "Check the heatbed heater & thermistor wiring for possible damage." Error name: Bed preheat error Error code: #31201 (CORE One)…

FINDA didn't trigger #04101 (MMU)

What happened? During Filament loading, either to the MMU unit or to the Nozzle, if the filament does not reach the  SuperFINDA or is not detected, the printer will show an error. How…

Homing error Y #26305 (MK4S) #13305 (MK4) #21305 (MK3.9) #23305 (MK3.5)

What happened? The Original Prusa MK4S/MK4/MK3.9/MK3.5 displays the message: "Failed to home the Y-axis, make sure there is no obstacle on Y-axis". Error name: Homing error Y Error…

External SPI flash W25X20CL/xFLASH not responding - error

This occurs on some boards and its cause can be somewhat elusive. The W25X20CL is a memory chip on the Einsy Rambo board. It is an issue when flashing the firmware and is normally…

QR Error codes

This is an advanced system for displaying error screens, providing more useful information to the user. In case of an issue, the printer will display the name of the error followed…

Unload manually #04506 (MMU)

What happened? Implausible SuperFINDA sensor reading. This error occurs when the SuperFINDA sensor detects filament inside the Selector, but the MMU has no record of any filament…

Ambient temperature check (MK3/MK3S)

The Einsy board of your printer is equipped with an NTC thermistor, which is used to measure the surrounding ambient temperature. The sensor is located right above the main power…

Preheat the nozzle!

The error message Preheat the nozzle! occurs when you are loading new filament and the nozzle did not reach the needed temperature to do so. The minimum temperature for loading…

Removing and object stuck to the bottom of the tank

In case the first layer did not stick to the printing platform, it would remain stuck at the bottom of the tank. No matter how big or how small the stuck layer is, here is a quick…

Maxtemp error print head #12206 (MINI)

What happened? The printer will display "Maxtemp error" for the print head if the printer's hotend temperature goes 305 ºC at any point. This is a safety feature to prevent printer…

Factory reset (MINI)

Stored separately from the firmware itself, in the mainboard's EEPROM, you have statistics of your printer, calibration data related to the movement of the printer, and PID values…

Blown Fuse (MINI)

The Original Prusa MINI is equipped with a 24V Buddy mainboard. This 32-bit logic board has two removable automotive fuses protecting the crucial components. If your printer or…

Skewed / deformed prints (SL1/SL1S)

A skewed/deformed print is usually caused by loose screws – either the large black knob at the top of the cantilever, the screw(s) on the cantilever itself or the resin tank screws. Solution Cantilever…

Hotend mintemp error #31208 (CORE One) #35208 (CORE One L) #26208 (MK4S) #13208 (MK4) #27208 (MK3.9S) #21208 (MK3.9)

What happened? The printer is showing the message "Check the print head thermistor wiring for possible damage." Error name: Hotend mintemp error Error code: #31208 (CORE One) #35208…

Blackout occurred. Recover print?

The error message Blackout occurred. Recover print? appears if the power goes off for a longer period of time during printing, and the hotend and heatbed cool down. Therefore,…

Thermal runaway bed #12203 (MINI)

What happened? The printer will display "Thermal runaway" for the heatbed if the printer drops the heatbed temperature by 25 ºC for an extended period of time. A general temperature…

MMU Overcurrent #31310 (CORE One) #35310 (CORE One L) #26310 (MK4S) #13310 (MK4) #27310 (MK3.9S) #21310 (MK3.9) #28310 (MK3.5S) #23310 (MK3.5)

What happened? The printer with the xBuddy board is equipped with a safety mechanism to detect power supply overcurrent situations in the Multi-material unit (MMU) connection.…

Visible layers (SL1/SL1S)

Even though SLA printers can achieve much better resolution than standard FFF/FDM 3D printers, layers on objects can be still visible if you look very closely. If you feel like…

Prints breaking away from the platform

The printing platform must be perfectly flat and degreased to ensure that the first prints are properly attached. If the pad or print itselfs separates from the printing platform,…

Homing error Z #31301 (CORE One) #35301 (CORE One L) #36301 (CORE One INDX) #26301 (MK4S) #13301 (MK4) #27301 (MK3.9S) #21301 (MK3.9)

What happened?  The printer is showing the message: "Failed to home the extruder in Z-axis, make sure the loadcell is working". Error name: Homing error Z Error code: #31301 (CORE…

Firmware update needed #04504 (MMU)

What happened? This error is shown when the MMU unit has an old or incompatible firmware version. The printer will show you an expected firmware version for the MMU unit. For example,…

Factory Reset (MMU)

This procedure is the same for the MMU3 and MMU2S units running firmware 3.0.0 or newer. In case you are running MMU2S with older FW, please go to Factory reset (MMU2S pre firmware…

Power Panic #36321 (INDX) #31321 (CORE One) #35321 (CORE One L) #26321 (MK4S) #13321 (MK4) #27321 (MK3.9S) #21321 (MK3.9) #28321 (MK3.5S) #23321 (MK3.5) 

What happened? The Original Prusa printers are equipped with a Power Panic feature. This feature can recover a print in case of a sudden power loss (read more about it here). The…

Holes in print (SL1/SL1S)

Large holes (defects) in printed objects are almost exclusively caused by dirt on the FEP foil or loose particles in the resin. Tiny pieces of debris on the bottom of the tank…

Scratches/bubbles on prints (SL1/SL1S)

Bubbles or small scratches (also appearing like cracks) on the object are caused by small pieces of dirt or debris in the tank (vat) you are using. These small objects travel in…

Loud noises from printer (SL1/SL1S)

When your printer emits loud noises, sounding like hammering onto sheet-metal. This can be caused by a firmware issue, or if resin has leaked into your printer through the tilt…

Maxtemp error bed #12205 (MINI)

What happened? The printer will display "Maxtemp error" for the heatbed if the printer's heatbed temperature goes above 110 ºC at any point. This is a safety feature to prevent…

Extruder preheat error #17202 (XL)

What happened? The message "Extruder preheat error: Check the heater and thermistor wiring for potential damage" is shown when the printer is unable to heat up the nozzle more…

De-lamination / separated layers (SL1/SL1S)

If you encounter de-lamination, separated layers, or missing layers, the cause is usually in a broken SL1/STL file. Another cause can be a faulty UV LED panel or dirt in the resin…

Connect Registration Failed #12401 (MINI)

What happened?  During the configuration of Prusa Connect on the Original Prusa MINI/+, an error on this configuration can occur and the printer shows the message "Registration…

Heatbed Port Overcurrent #31309 (CORE One) #35309 (CORE One L) #26309 (MK4S) #13309 (MK4) #27309 (MK3.9S) #21309 (MK3.9) #28309 (MK3.5S) #23309 (MK3.5) #12309 (MINI) #36309 (INDX)

What happened? Your printer is showing the message: "Overcurrent detected on xBuddy/Buddy heatbed port, disconnect the device." Error name: Heatbed Port Overcurrent Error code:…

Live Z adjust not saving

The Live Z Adjust is a tool that is used for easy corrections of the 1st three layers of your prints. In this article, we will look at the most common problem associated with it,…

Warped layers (SL1/SL1S)

Most resins have a tendency to shrink by several micrometers after they are cured. These expansions and resulting forces can lead to layer warping and layer separation. However,…

No file on USB #12604 (MINI/MINI+)

What happened? When flashing the firmware with the Alternative Method, you might get the text "Firmware file missing in the USB flash!". Error name: No file on USB Error code:…

Filament sensor didn't trigger #04103 (MMU)

What happened? If, during the filament load-to-nozzle process, the extruder's filament sensor is not triggered, the printer will display an error. How to fix it? Assembly Remake…

Missing parts (SL1/SL1S)

A print can finish even if some parts of the object weren’t printed fully, though a missing part of an object will more often cause the whole print-job to fail. Try printing a…

Connect Registration Failed #17401 (XL)

What happened?  During the configuration of Prusa Connect on the Original Prusa XL, an error on this configuration can occur and the printer shows the message "Registration to…

Selector cannot home #04115 (MMU)

What happened? Before it can align with any of the filament positions, the selector on the MMU unit needs to be “homed” to determine its position. For that, the selector moves…

Hotend thermal runaway #31204 (CORE One) #35204 (CORE One L) #26204 (MK4S) #13204 (MK4) #27204 (MK3.9S) #21204 (MK3.9)

What happened? The printer is showing the error "Hotend thermal runaway: Check the print head thermistor wiring for potential damage". Error name: Hotend thermal runaway  Error…

Object missing details

The Original Prusa SL1 3D printer can produce objects with an incredible amount of detail – tiny wrinkles on cloth of a figure, texture of skin, thin railings on buildings, etc.…

Nozzle Cleaning Failed #17834 (XL)

To achieve good quality prints, it is fundamental that the nozzle can make the right amount of contact with the print surface. In case this is not achieved, the printer will show…

Blown Fuse (MK4/S, MK3.9/S)

The Original Prusa MK4/S and MK3.9/S are equipped with a 24V xBuddy mainboard. This 32-bit logic board has three removable automotive fuses protecting the crucial components. If…

Saving log file (SL1/SL1S)

If you encounter an issue, we may request the log file from your Original Prusa SL1. This contains a wide range of info specific to your unit. By going to the printer menu to Settings…

SL1 Tilt-mechanism error

This error was changed in firmware version 1.5.0! This article only applies to SL1 printers with firmware older than 1.5.0. During the Wizard, the SL1 will test the tilting-motion…

Filament not loading (XL)

If the filament is not loaded into the extruder, yet the printer is trying to pull the filament inside, there might be a hardware problem in some of the extruder components: we…

Tilt homing failed #10101 (SL1/SL1S)

What happened? The printer is displaying the message: Tilt homing failed, check its surroundings, and repeat the action. Error name: Tilt homing failed Error code: #10101 Issued…

Resin sensor error #10307 (SL1/SL1S)

What happened? The printer displays the message: The resin sensor was not triggered. Check whether the tank and the platform are properly secured. Error name: Resin sensor error Error…

Filament sensor too early #04106 (MMU)

What happened? When loading the filament from the MMU to the extruder, the printer uses the extruder filament sensor to detect when the filament arrives in the extruder. Since…

Homing error Z #17301 (XL)

What happened? The printer displays the message "Failed to home the Z-axis, make sure the loadcell is working". Error name: Homing error Z Error code: #17301  How to fix it? Check…

Tower homing failed #10102 (SL1/SL1S)

What happened? The printer is displaying the message: Tower homing failed, make sure there is no obstacle in its path and repeat the action. Error name: Tower homing failed Error…

Firmware update failed #10534 (SL1)

What happened? The printer is displaying the message: The update of the firmware failed! Restart the printer and try again. Error name: Firmware update failed Error code: #10534 How…

Extruder thermal runaway #17204 (XL)

What happened? The printer will display "Extruder thermal runaway: Check the thermistor wiring for potential damage" if the temperature on the nozzle drops by 6 ºC for an extended…

Troubleshooting the MINI/MINI+ assembly

Filament sensor: Fil. stuck #04104 (MMU)

What happened? When the MMU unit unloads a filament from the extruder, the filament sensor inside the extruder should stop detecting the filament. In case it does not, this error…

Nozzle Cleaning Failed #31834 (CORE One) #35834 (CORE One L) #26834 (MK4S) #13834 (MK4) #27834 (MK3.9S) #21834 (MK3.9) #17834 (XL)

To achieve high-quality prints, the nozzle must make the correct amount of contact with the print surface. If this is not achieved, your printer will display the message "Nozzle…

Service menu - Individual Filament Calibration

Bed thermal runaway #31203 (CORE One) #35203 (CORE One L) #36203 (CORE One INDX) #26203 (MK4S) #13203 (MK4) #27203 (MK3.9S) #21203 (MK3.9) #28203 (MK3.5S) #23203 (MK3.5) 

What happened? The printer is showing the message "Check the heatbed thermistor wiring for possible damage." Error name: Bed thermal runaway  Error code: #31203 (CORE One) #35203…

Selftest failed (XL single-tool)

On the Original Prusa XL, the selftest checks for issues in the assembly of the printer, its wiring and the electronic components. It is the first part of the Calibration Wizard,…

Puppy error #17514 (XL)

What happened? On the Original Prusa XL, communication with the peripheral boards (e.g. Dwarf board) is achieved using the MODBUS protocol. In MODBUS, there are two types of devices:…

Homing Error #12301 (MINI)

What happened? During calibration, mesh bed leveling, or before a print, it is crucial for the printer firmware to determine the print head and heatbed position. This is done through…

Fan failure #10106 (SL1/SL1S)

What happened? The printer is displaying the message: Incorrect RPM reading of the fan. Please check its wiring and connection. Error name: Fan failure Error code: #10106 This…

I2C Send failed #31311 (CORE One) #35311 (CORE One L) #36311 (CORE One INDX) #26311 (MK4S) #13311 (MK4) #27311 (MK3.9S) #21311 (MK3.9) #28311 (MK3.5S) #23311 (MK3.5) #12311 (MINI/+)

What happened? On your Prusa Printer, the I2C bus is used for the xBuddy and Buddy boards to communicate with other printer components. If there is an error in sending data from…

Tool offset out of bounds #17104 (XL)

What happened? On the multi-tool versions of the Original Prusa XL, the offset of the tools compared to the first is calibrated through the Tool Offset Calibration. If the offset…

Temperature sensor failed #10205 (SL1/SL1S)

What happened? The printer is displaying the message: The Ambient temperature/UV LED temperature sensor failed. Error name: Temperature sensor failed Error code: #10205 The SL1…

Dock position out of bounds #17103 (XL)

What happened? The XL tool heads are connected to a metal profile on the back extrusion of the XL. During the selftest of the multi-tool head, the wizard will guide you through…

Invalid API key #10405 (SL1/SL1S)

What happened? The printer is displaying the message: Please turn on the HTTP digest (which is the recommended security option) or update the API key. You can find it in Settings…

Factory reset (SL1/SL1S)

Stored separately from the firmware itself, you have calibration data related to the operation of the printer and various statistics. If these values become corrupted or are not…

Display test failed #10120 (SL1/SL1S)

What happened? The printer is displaying the message: Display test failed, check the connection between the display and the A64 board. Error name: Display test failed Error code:…

Bed mintemp error #31207 (CORE One) #35207 (CORE One L) #36207 (CORE One INDX) #26207 (MK4S) #13207 (MK4) #27207 (MK3.9S) #21207 (MK3.9) #28207 (MK3.5S) #23207 (MK3.5)

What happened? The printer is showing  the message "Check the heatbed thermistor wiring for possible damage." Error name: Bed mintemp error  Error code: #31207 (CORE One) #35207…

Puppy error #17513 (XL)

What happened? On the Original Prusa XL, communication with the peripheral boards (e.g. Dwarf board) is achieved using the MODBUS protocol. In MODBUS, there are two types of devices:…

Expect overheating #10714 (SL1/SL1S)

What happened? The printer is displaying the message: Incorrect RPM reading of the fan. The print may continue, however, there's a risk of overheating. Warning name: Expect overheating Warning…

Status LED explained (MMU3)

This article is describing the status of the LEDs located on the multi material unit. Together there are five LEDs on the unit that correspond to the five available filament positions.  Attention:…