Original Prusa MK4

Printer troubleshooting

Sample G-codes

Each Original Prusa printer is shipped with a bundle of sample G-codes. These G-codes are tested and tailored specifically for your printer model and can be used to see the printer's…

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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…

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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…

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Clogged hotend (MK4)

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

Spaghetti monster

Connect Registration Failed

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

PrusaLink Troubleshooting

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

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

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

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

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

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

Status LED explained (MK4/XL)

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

MMU Overcurrent #26310 (MK4S) #13310 (MK4) #21310 (MK3.9) #23310 (MK3.5)

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

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

Nozzle Cleaning Failed (MK4, MK3.9)

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

I2C Send failed #26311 (MK4S) #13311 (MK4) #21311 (MK3.9) #23311 (MK3.5)

Bed mintemp error #26207 (MK4S) #13207 (MK4) #27207 (MK3.9S) #21207 (MK3.9) #28207 (MK3.5S) #23207 (MK3.5)

Loadcell Timeout #31528 (CORE One) #26528 (MK4S) #13528 (MK4) #27528 (MK3.9S) #21528 (MK3.9)

I2C Receive Failed #26315 (MK4S) #13315 (MK4) #21315 (MK3.9) #23315 (MK3.5)

Nozzle Heater Overcurrent #26308 (MK4S) #13308 (MK4) #21308 (MK3.9)

Loadcell Measure Failed #31526 (CORE One) #26526 (MK4S) #13526 (MK4) #27526 (MK3.9S) #21526 (MK3.9)

Firmware Update Required #26701 (MK4S) #13701 (MK4) #21701 (MK3.9) #23701 (MK3.5) #31701 (CORE One)

Loadcell Not Calibrated #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)

Heatbreak MAXTEMP Error #26212 (MK4S) #13212 (MK4) #27212 (MK3.9S) #21212 (MK3.9) #31212 (CORE One)

Bed maxtemp error #26205 (MK4S) #13205 (MK4) #27205(MK3.9S) #21205 (MK3.9) #28205 (MK3.5S) #23205 (MK3.5) #31205 (CORE One)

Loadcell Bad Configuration #31527 (CORE One) #26527 (MK4S) #13527 (MK4) #27527 (MK3.9S) #21527 (MK3.9)

Heatbreak MINTEMP Error #26211 (MK4S) #13211 (MK4) #27211 (MK3.9S) #21211 (MK3.9)

Tangled filament

Loadcell Tare Error #31524 (CORE One) #26524 (MK4S) #13524 (MK4) #27524 (MK3.9S) #21524 (MK3.9)

Blue Screen of Death (BSOD)

Loadcell Tare Failed #31525 (CORE One) #26525 (MK4S) #13525 (MK4) #27525 (MK3.9S) #21525 (MK3.9)

Loadcell troubleshooting

EEPROM I2C Receive Busy #26316 (MK4S) #13316 (MK4) #21316 (MK3.9) #23316 (MK3.5)

LED Memory Error #31529 (CORE One) #26529 (MK4S) #13529 (MK4) #27529 (MK3.9S) #21529 (MK3.9) #28529 (MK3.5S) #23529 (MK3.5)

I2C Send Timeout #26313 (MK4S) #13313 (MK4) #21313 (MK3.9) #23313 (MK3.5)

I2C Send busy #26312 (MK4S) #13312 (MK4) #21312 (MK3.9) #23312 (MK3.5)

Hotend temp not matching #26210 (MK4S) #13210 (MK4)  # 27210 (MK3.9S) #21210 (MK3.9) #31210 (CORE One)

I2C Receive Timeout #26317 (MK4S) #13317 (MK4) #21317 (MK3.9) #23317 (MK3.5)

I2C Send Undefined #26314 (MK4S) #13314 (MK4) #21314 (MK3.9) #23314 (MK3.5)

I2C Receive undefined #26318 (MK4S) #13318 (MK4) #21318 (MK3.9) #23318 (MK3.5)

Under-extrusion (Nextruder printers)

Heaters Timeout #31817 (CORE One) #26817 (MK4S) #13817 (MK4) #27817 (MK3.9S) #21817 (MK3.9) #28817 (MK3.5S) #23817 (MK3.5) #17817 (XL) #12817 (MINI)

Fil. sensor troubleshooting #26114 (MK4S) #13114 (MK4) #27114 (MK3.9S) #21114 (MK3.9) #28114 (MK3.5S) #23114 (MK3.5)