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How to replace the hotend fan (XL Multi-tool)

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How to replace the hotend fan (XL Multi-tool)

How to replace the hotend fan (XL Multi-tool)
Relevant for:
XL
Last updated 10 months ago
How to replace the hotend fan (XL Multi-tool)
 Difficulty
Moderate
 Steps
20
 Available languages
ENCSPLDEITFR

Step 1 Introduction

Introduction
Introduction
⬢This guide will take you through the replacement of the hotend fan on the Original Prusa XL.
Some parts might slightly differ. However, it does not affect the procedure.
⬢All necessary parts are available in our eshop prusa3d.com.
Note that you have to be logged in to have access to the spare parts section.

Step 3 Unloading filament

Unloading filament
Unloading filament
Unloading filament
The following step is necessary only if you have filament loaded.
⬢Unload the filament from the hotend. On the screen, navigate to Filament -> Unload Filament.
⬢Cool down the printer to room temperature. On the screen, navigate to Preheat -> Cooldown.
Wait for the printer to fully cool down to room temperature before proceeding further.

Step 4 Protecting the heatbed

Protecting the heatbed
Protecting the heatbed
⬢Before you proceed, it is recommended to protect the heatbed.
⬢Make sure the heatbed is cooled down to ambient temperature. Place the empty cardboard box approximately to the front center part of the heatbed.

Step 5 Preparing the printer

Preparing the printer
Preparing the printer
Preparing the printer
⬢On the printer screen, navigate to Control -> Pick/Park Tool -> Park Current Tool.
⬢Turn the power switch OFF (symbol "O").
⬢From the rear side of the printer, unplug the PSU cable.

Step 6 Undocking the Nextruder

Undocking the Nextruder
Undocking the Nextruder
Undocking the Nextruder
⬢Remove the Nextruder, by pulling it outwards from the metal inserts.
Although a small resistance is expected, as the metal inserts are magnetic, use moderate force.
⬢Carefully place the Nextruder on the cardboard box.

Step 7 Disconnecting the Nextruder

Disconnecting the Nextruder
Disconnecting the Nextruder
Disconnecting the Nextruder
⬢With Torx T10 screwdriver, loosen the two M3x8rT screws from the black nylon flexible plate, and unhook it from the tool. Don't remove the screws completely.
⬢Unscrew the Festo fitting from the Nextruder or push on the blue collar on top of the fitting and pull out the PTFE tube.
⬢Disconnect the main Dwarf cable.
Each connector has a safety latch. It is necessary to press the latch before disconnecting. Otherwise, the connector may get damaged.
⬢Transfer the Nextruder to a safe working space.

Step 8 Removing the toolchanger board

Removing the toolchanger board
Removing the toolchanger board
Removing the toolchanger board
Removing the toolchanger board
⬢With Allen key 2.5 mm remove the M3x30 screw of the fan shield.
⬢Remove the M3x8rt screws.
⬢Unplug the toolchanger cable.
⬢Remove the toolchanger.

Step 13 Mounting the new hotend fan

Mounting the new hotend fan
Mounting the new hotend fan
⬢Attach the hotend fan to the heatsink, and tighten it with two M3x18rT screws.
Mind the orientation of the fan and the position of its cables.

Step 14 Connecting the Nextruder cables

Connecting the Nextruder cables
Connecting the Nextruder cables
Connecting the Nextruder cables
⬢Plug the hotend fan cable into the Dwarf board.
⬢Secure all the cables except for the toolchanger cable with a zip tie.
Be careful not to pinch any wires.

Step 15 Reattaching the toolchanger

Reattaching the toolchanger
Reattaching the toolchanger
Reattaching the toolchanger
⬢Attach the toolchanger board with the fan shield to the Nextruder.
⬢Secure the fan-shield with a M3x30 screw.

Step 16 Covering the Dwarf board

Covering the Dwarf board
Covering the Dwarf board
Covering the Dwarf board
⬢Close the printed Dwarf board cover on the Nextruder.
⬢Secure the Dwarf board cover with a M3x12 screw.

Step 18 Connecting the nextruder

Connecting the nextruder
Connecting the nextruder
Connecting the nextruder
⬢Insert the PTFE tube into the festo connector as far as possible. Slighty tug on the PTFE tube to make sure it's firmly secured.
⬢Plug the Dwarf extruder cable to the Dwarf board.
⬢Slide the black nylon plate onto the two M3x8rT screws in the Cheese board.
Make sure the nylon plate is not twisted.
⬢Tighten the two M3x8rT screws with a Torx T10 key.

Step 19 Docking the tool

Docking the tool
Docking the tool
Docking the tool
Docking the tool
⬢Carefully turn the printer so that the front side is facing towards you.
⬢Take the Nextruder and place it carefully next to the dock.
⬢Place the two metal inserts through the white holes in the dock. The magnets will help you dock the Nextruder.
Check that the Nozzle seal lightly touches the nozzle.
⬢Turn on the printer and run the Selftest.
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