Consistent "filament is wrong" when starting prints
 
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meltdown
(@meltdown)
Active Member
Consistent "filament is wrong" when starting prints

Hi there! I'm not sure if this belongs under MMU3, PrusaSlicer, or Prusa Connect; I'm guessing Prusa Connect.

Every time I schedule a print, I get the "Filament is wrong" dialog. The MMU3 on my MK4 knows the correct filament types from a "load to MMU advanced" operation, and I have all the filaments matching in PrusaSlicer's filament list (in my case, PETG, PETG, PLA, PLA, PLA). I'm using the "Original Prusa MK4 MMU3 0.4mm nozzle" preset.

When I look on Prusa Connect during printing, it correctly knows the filament type. And when I check between print jobs, it shows a single material as being loaded, even though the MK4 unloads the filament back to the MMU3 after the print is complete.

How can I convince Prusa Connect to agree on filament types with my MK4?

Postato : 30/08/2025 6:31 pm
3DPC
 3DPC
(@3dpc-2)
Eminent Member
RE: Consistent "filament is wrong" when starting prints

Check that the name of the filament is the same in Prusaslicer and Connect. In Prusaslicer the name in under filament/advanced - ensure it matches with connect

Postato : 02/09/2025 12:02 pm
meltdown
(@meltdown)
Active Member
Topic starter answered:
RE:

If I'm understanding you correctly, the filament names are the same. See attached.

Jessie PLA selected Jesse PLA not changed from default setting of PLA PLA shown in Prusa Connect

Questo post è stato modificato 2 days fa da meltdown
Postato : 02/09/2025 6:40 pm
meltdown
(@meltdown)
Active Member
Topic starter answered:
RE: Consistent "filament is wrong" when starting prints

This also happens when queuing a print through the Prusa Connect web interface directly. The print file says PLA/PLA on slots 3 and 4, the MMU has PLA loaded in slots 3 and 4, and Prusa Connect knows that. I don't know why the material at the top is showing "PETG" now; there's no loaded filament (everything is loaded only to MMU), and I was last printing PLA.
Filament types match mismatching filament warning still appears

Postato : 03/09/2025 5:10 pm
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