Now that's really really frustrating I can imagine.
You have the benefit of having 2 machines to compare with.
I would take one of the working machines and start switching one component at a time from this working machine with the same component of the layers-not-touching-machine and start prints concurrently to see if the behaviour at some point changes.
I would start with some non-apparent things like physical placement of the machines (because it's easy; sometimes the location like a cold drag or similar could affect printing)
Then maybe the physical outlets.
Then switching the filament rolls.
Then perhaps change the electronics boards.
Then the entire print head assembly.
Then the feeder.
Then....the glass bed?
The heated aluminum plate....
....and, well, if you would have the endurance to go through it, it would be very interesting to hear about the results. Good luck!!
Your other 2 UM2+ are printing the same file without any problems? or they work with the same filament in other projects without problems?
Link to post
Share on other sites