It could be that you knurled feeder wheel needs cleaning or it could have worn a bit so the little triangles are not as sharp anymore. To test this you could clean it and move it to a new spot on the knurled wheel.
Are you positive it's not on older prints? The lines not touching thing has been an unexplained issue on a lot of new machine prior to UM2+ And I even got a new UM2go that had this issue from day 1 and was never resolved.
I have since upgraded my UM2go to a UM2go+ and it's well worth doing.
I would also use the TFM coupler (or TFT) as it's a lot better then the PTFE.
Changing the axis rods have helped some people. If they are bent in the middle the bed leveling can be good as it's measured in the outer corners can be fine but the middle distance can be greater.
Recommended Posts
rowiac 53
How does your teflon coupler look? If it gets slightly worn it can cause underextrusion issues. At ~4000 hours of printing, I assume you have changed it several times though.
Link to post
Share on other sites