MMU2 idler is not turning properly
I’m trying to troubleshoot a MMU2 I’ve just installed on my MK3 printer (with the B7 extruder upgrade installed).
I can only occasionally get the first filament to load. I have checked the proper spacing of the Finda sensor and ball. The alignment of all 5 pulleys appears to be correct. I’ve adjusted the tensioning system.
In examining the behavior of the system during filament loads, I’m seeing a couple of potential problems. The most significant one is that the idler is not turning beyond the point of the bearing for the first filament being properly positioned. I don’t believe that the Extruder motor of the MMU is even attempting to turn the idler to follow the selector lead screw as it moves across the 5 filaments. Though I can easily move the idler by hand when the idler unit is opened up, the Extruder motor is not resulting in the idler moving properly. It appears that the Extruder motor is not moving the idler to line up the bearings of the 2-5 filaments.
The other issue I’m having is that even the first filament doesn’t often load. It appears that the filament being loaded is bending inward and thus missing the entrance to the acceptance hole of the pulley body.
I’m at this point at a loss to further troubleshoot either of these issues.
Thanks for any help.
Is this a good question?