Mar 28, 2024 · My MMU3 is not loading the filament. I can hear the motors turning and the idler lines up but the filament will not catch on even if the idler is tightened all the way.

Apr 26, 2024 · I've completed the build of the MMU3 and it prints great. Filament changes during print happen without issues and I've been able to succesfully print multicolor models. I made …

Welcome to the MMU3 assembly and review. There were several generations of the Original Prusa Multi-Material Unit (MMU) printing solution.

Feb 2, 2024 · Bottom line is that if the I/R sensor board is too high, the arm will not block all the I/R and give false readings. Look inside the side of the chimney and if there is a 2mm gap then …

Oct 31, 2025 · You need to ensure the setting in the printer matches the length exactly. Too short or too long by a few mm and you'll get the symptoms you describe. For the failure mode I …

May 24, 2024 · I'm currently running a MK4 with MMU3 on the latest firmware. Whenever I finish a print, whether a single or multi-material print I get the message: Printer has detected multiple …

Inspect the extruder to rule out a hardware fault, such as misaligned Bondtech gears or Extruder Idler shaft not inserted correctly. If the issue persists over multiple unloads, check the extruder …

Jul 19, 2024 · It fixed the main reason I was trying it and also fixed the misfeed issue I was having. I think part of the cause of the misfeed is the Pulley body has wider channels before …

Apr 1, 2024 · It mostly stems from an issue on the hot end. When the filament loads to the hot end, many times it creates a ball on the end of the filament because it doesn't load all the way …

Mar 18, 2025 · I have upgraded my MMU2 to MMU3 and have not being able to get it working. Had heaps of load errors and idler homing problems. I finally managed to get all the filament to …