Filament not retracting fully - causing jamming
Background: MK3S with MMU2S - worked pretty well, with a couple issues mostly due to the underpowering of the motors. Upgraded to MK4 and MMU3.
The MK4 portion works great. However I have had a lot of issues with the MMU with the filament getting jammed at the Selector. From what I can see it appears that the filament, when retracted, doesn't always fully retract so when the Selector moves its bends the filament tip. Then on the next load of that filament it can't feed into the Selector. Sometimes it doesn't retract a fair amount so it drags the filament out and then jams under the selector.
It doesn't happen on every change and I can go thru a couple dozen or so changes before it happens. In addition its not always the same filament/position that does it. I've tried
- turning on "cutting" the tip, but that didn't help.
- loosening and tightening the screws on the ideler cover, but that didn't help
Thoughts/suggestions on what could be causing it or what to try next?
- 1st "printer" TIKO 3D
- 2nd PRUSA i3 MK2S with MMU v1
- 3rd PRUSA i3 MK2S
- 4th PRUSA i3 MK3 with MMU v2- 5th PRUSA i3 MK4 (upgraded from MK3) with MMU v3 (upgraded from…
RE: Filament not retracting fully - causing jamming
It has started doing this to me the last 7 days or so as well.It never happened before and I have tried all the above points and the condition is the same.
I own: MK4 and MMU3
RE: Filament not retracting fully - causing jamming
I’m having the same issues with mk4/mmu3. I get it to preload and load to nozzle functions but when I start my print, it starts. It is not always the same slot and not all the time. I have changed filament to new filament but still same problem. Could it be the cutter on the selector?