That is strange, is there a chance that your umbilical is sagging and snagging?
Just uploaded “aza-ptfe-guide-110mm.v4.stl” for the PTFE Guide, earlier version was 60mm radius, new one being 110mm radius helps suspend Umbilical higher off the rails.
Ideally, the aza-ptfe-guide-mount-v4.stl (that attaches to extrusion and Sensor) should also be updated to have a recess/well for the 90 degree bend to seat inside of.
Recent discussions, and previous ones (e.g. fans-on-stepper-motors and taller-lr3-build/…/81) about keeping steppers cool influenced me into trying out some cheap Alu 40mm x 40mm heatsinks. Hopefully the Temp stickers will reveal IF/What difference those make, am not wanting to put additional fans on the steppers if possible.
I haven’t printed as much on the MP3DP as you, so am looking to you for guidance/ideas from your posts. Appreciate you sharing your experience and observations. Cheers!