FAQ - Frequently Asked Questions

Updated 6 days ago ​by Mikolas

1. The first layer does not stick to the print surface

Pretty much 90% of all print errors are caused by an improper First layer. Therefore, it is really important to have it set perfectly.

Other common printing errors are documented in this category ____________.

  1. Make sure your Live Z adjust is set correctly. More negative value = first layer more squished to the build plate) Please refer to 1st layer calibration (Live Z adjust) for more information. If you are not sure how a perfect First layer looks like, check out the photo below.
  2. Clean the print surface before every print, it takes just a few seconds. Use at least 90% or more IPA (isopropyl alcohol) and once in a while acetone.
  3. Please refer to the PEI print surface preparation and Bed level correction (Kit only) articles for more information.

2. Firmware updating & flashing

Having the latest firmware ensures that you are getting most out of your printer. You can check your current Firmware version in LCD menu - support - Firmware [version]. The newest one is available at prusa3d.com/drivers.

  1. Always pay extra attention once downloading the firmware for your current device, downloading different one would compromise the process (MK2/ Multimaterial or MK3).
  2. Only *.hex files are allowed for the update! 
  3. You can find the full guide in the Firmware upgrade and flashing article.

3. Clicking PSU

Due to the fact that our Original Prusa i3 MK3 is super quiet, "clicking" noises coming out of the PSU become a lot more noticeable. However, there is no need to worry about it, as every PSU on both 120V and 230V does this normally. If you are looking for more information on this subject, visit this article, where we describe this phenomenon little more prusaprinters.org.

4. "Gum" in the PSU

Have you ever noticed there is an odd looking white gum inside of the PSU? Actually, it is nothing abnormal as it is RTV glue/silicone (room temperature vulcanization silicone). It's used to mechanically fix through-hole components to the board to prevent vibrations.

5. MINTEMP message on LCD

This feature prevents the printer from uncontrollable heating if there is a problem with one of the thermistors or if the room is too cold for printing. 

  1. Make sure the ambient temperature in the room is at least 16°C.
  2. Check that the thermistors are properly seated in place, their wires are not damaged and that their connectors are plugged correctly into the motherboard. Also, for MINTEMP BED, make sure that the thermistor is properly seated under the golden Kapton tape.
  3. You can find more information in the MINTEMP article.

    6. THERMAL RUNAWAY error

    This error triggers if the temperature drops more then 15°C for more than 45 seconds to prevent uncontrollable heating and potential fire hazard in case of a wrong temperature reading.

    1. If the printer is in a cold environment with a lot of airflows (next to open window), move it to a warmer room (20°C or more) or to a spot with less airflow.
    2. Check the thermistor cable, connector and visually check the thermistor if it is still securely placed in the heater block.
    3. Get more information in the Thermal Runaway & Temperature drops article

    7. Other  

    Here you can find some other useful links. Would you be still looking for something else? Try to use the search or you can go back to the main page for all of the categories.

    1. Bed level correction (Kit only) how to use the bed level correction. 
    2. Loud printer how to make your printer quieter. 
    3. PEI/Ultem is damaged & Guide how to replace it how to replace damaged PEI. 
    4. General maintenance: Bearings, Fans, Extruder driver gear, Electronics & PEI. General maintenance for Printer parts.
    5. Firmware updating & flashing problems. common sources of firmware updating fail.

    If you did not find what you were looking for. Do not hesitate to contact us at info@prusa3d.com


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