Problem: Filament resistance/grinding. Fix: Use PTFE 3mm ID instead of 2mm ID?
Hello! Thoughts on using 3mm ID instead of 2mm ID for PTFE? Am trying to setup.
Problem: Filament friction/resistance is causing extruder to grind filament rather than extrude. Am following Chris Riley's helpful tutorials, Part 3 of his series "Back out Seconds" section (https://youtu.be/kT5ongBcMLQ?si=KX-neijvsh2CWTEg&t=1176) shows how to load the filament, testing how far filament extrudes in 10secs. Am observing filament not extrude, but instead grind, because wheel bearing pressure and/or PTFE tube resistance and/or Y-adapter resistance are too much.
Am running into problem with filament getting stuck in the Y Adapter. Can't see any kinks in supplied stock 2mm ID / 4mm OD PTFE. And the filament looks fine, spot checked filament diameter, swapped for different filament. Neither filament seems kinked. Seems easier to manually shove silk pla filament through the PTFE than matte pla pro 🤷♂️. Am mostly using Overture PLA if that matters.
Am looking closely to see whether filament is getting stuck on fittings. Doesn't seem to be.
Have untwisted/unraveled PTFE tube which comes coiled when packed. Haven't relaxed the tube with heat, but I don't understand if/why the PTFE needs to be 2mm ID. Just ordered some 3mm ID to try out.
Any advice on other things I should try first? Cheers!
Agree, makes sense. I'll check filament isn't getting overly crushed/teeth-marked during extrusion. Cheers!
Took Y adapter apart, cleaned up and reamed cut PTFE that goes to that. Tried to determine how much resistence is caused by PTFE vs the Selector-Extruder block that came preassembled in the MK3 kit. With the power cable disconnected (so steppers are re-energized and slider can be forced to move), I move the slider enough to allow filament to slide pass extruder gear, but no so much that it snags on entry to the filament block hole. Am taking the block apart, mainly to see how they work.