Original Prusa MK3.9

Printer troubleshooting

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)

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,…

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

Spaghetti monster

Connect Registration Failed

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

PrusaLink Troubleshooting

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

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

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

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

Status LED explained (MK4/XL)

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

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

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

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

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

Loadcell Timeout #31528 (CORE One) #35528 (CORE One L) #26528 (MK4S) #13528 (MK4) #27528 (MK3.9S) #21528 (MK3.9)

Loadcell Measure Failed #31526 (CORE One) #35526 (CORE One L) #26526 (MK4S) #13526 (MK4) #27526 (MK3.9S) #21526 (MK3.9)

Loadcell Not Calibrated #31523 (CORE One) #35223 (CORE One L) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)

Heatbreak MAXTEMP Error #31212 (CORE One) #35212 (CORE One L) #26212 (MK4S) #13212 (MK4) #27212 (MK3.9S) #21212 (MK3.9) 

Bed maxtemp error #31205 (CORE One) #35205 (CORE One L) #26205 (MK4S) #13205 (MK4) #27201 (MK3.9S) #21201 (MK3.9) #28201 (MK3.5S) #23201 (MK3.5)

Loadcell Bad Configuration #31527 (CORE One) #35527 (CORE One L) #26527 (MK4S) #13527 (MK4) #27527 (MK3.9S) #21527 (MK3.9)

Heatbreak MINTEMP Error #31211 (CORE One) #35211 (CORE One L) #26211 (MK4S) #13211 (MK4) #27211 (MK3.9S) #21211 (MK3.9)

Tangled filament

Hotend maxtemp error #31206 (CORE One) #35206 (CORE One L) #26206 (MK4S) #13206 (MK4) #27206 (MK3.9S) #21206 (MK3.9) #28206 (MK3.5S) #23206 (MK3.5)

Loadcell Tare Error #31524 (CORE One) #35524 (CORE One L) #26524 (MK4S) #13524 (MK4) #27524 (MK3.9S) #21524 (MK3.9)

Blue Screen of Death (BSOD)

Loadcell Tare Failed #31525 (CORE One) #35525 (CORE One L) #26525 (MK4S) #13525 (MK4) #27525 (MK3.9S) #21525 (MK3.9)

Hotend temp not matching #31210 (CORE One) #35210 (CORE One L) #26210 (MK4S) #13210 (MK4) #27210 (MK3.9S) #21210 (MK3.9)

Under-extrusion (Nextruder printers)

Connect Registration Failed #21401 (MK3.9)

Heaters Timeout #31817 (CORE One) #35817 (CORE One L) #26817 (MK4S) #13817 (MK4) #27817 (MK3.9S) #21817 (MK3.9) #28817 (MK3.5S) #23817 (MK3.5) #17817 (XL) #12817 (MINI)

Fil. sensor troubleshooting #31114 (CORE One) #26114 (MK4S) #13114 (MK4) #27114 (MK3.9S) #21114 (MK3.9) #28114 (MK3.5S) #23114 (MK3.5)