First Filament Position not feeding completely. Suggestions?
I’ve assembled and installed the MMU2 on my MK3. For some reason, when using the first filament position, it never reaches the head’s filament drive. It does from position 2 and 3. (haven’t tried 4 and 5 yet).
I’ve swapped the following from position 2 without fixing the issue:
The filament (3 different filaments), the spool cradle and the PTFE tubes (long tubes from the spools and the really small tubes between the drive pulleys and the filament selector).
The filament gets past the print head sensor. It just doesn’t get to the drive gears, so the printer doesn’t know there is an issue. My theory is there is some slight delay that makes the amount of filament moved just short of what is required before the print head drive is triggered.
Past the PTFE tubes there is very little that is exclusive to the first position. I’ve checked to see if the pathways are smooth with an undersized drill bit. I’ve double checked the drive pulley in the MMU.
Update: 4 and 5 won’t load either.
I’m not sure why there are 2 places to look but there is another thread on shop.prusa3d.com that is addressing this issue and has lots of info.
I’ve gotten really far with this information. I’m going to post a bit of info there.
Is this a good question?