Filament getting jammed pre-loading into MMU—filament tip kept sharp
 
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Filament getting jammed pre-loading into MMU—filament tip kept sharp  

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jlconlin
(@jlconlin)
Member
Filament getting jammed pre-loading into MMU—filament tip kept sharp

I really struggle getting my filament to pre-load into the MMU. Nearly every time, it snags when exiting the PTFE tube and entering the MMU itself. I know Prusa's instructions say to keep the tip sharp, which I do, but still struggle with this frequently. Yesterday I opened the MMU and cleaned out the rollers, but this seems to be a problem before it even gets to the rollers.

This seems to me to be a very sensitive design. If I'm lucky enough to get it working, I'll likely see it go wrong the next time I have to change the filament.

Can someone please suggest ways I can make this work better? Are there some mods I can do to improve this? Maintenance?

Posted : 29/01/2025 4:41 am
Ineal
(@ineal)
Estimable Member
RE: Filament getting jammed pre-loading into MMU—filament tip kept sharp

i Streight the Filament bevor i go into the last part of Tube, go to menu and start "preload to mmu slot ..." start activate the motor and push it in. yes it is a little tricky but not to hard

Posted : 01/02/2025 8:26 pm
Tom De Winter
(@tom-de-winter)
Estimable Member
RE: Filament getting jammed pre-loading into MMU—filament tip kept sharp

I try to round the tip a bit and that seems to help. To be clear, the hangup is before the serrated drive pulleys

Posted : 02/02/2025 1:20 am
iftibashir
(@iftibashir)
Prominent Member
RE: Filament getting jammed pre-loading into MMU—filament tip kept sharp

Have you checked to ensure the PTFE tubes are properly seated and pushed right in??

If you open the MMU3 there is a small viewing hole where the end of the tube should be visible (just before the filament touches the pulley's)

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Posted : 26/02/2025 10:20 am
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