Hello,
i have my um2 for quite a bit of time and it used to give me a headache from time to time with the well debated issue (top layer lines not touching, etc.). It's definitely not underextrusion in my case.
The issue seemed to come and go, we learned to live with it and we ditch the failed prints when the issue came back. However, during the recent maintenance of the printer as i moved the printhead by hand i noticed the rods (the thick ones, X/Y) are not straight. I can even see it with naked eye, the rod is bent and as i slide the printhead, it moves and it has some effect on the printhead (it is raising/lowering the head by just tiny bit)
I think this issue has been there since we bought the printer and has caused this issue. I'm now clueless what to do - where should i get new x/y rods?
Thank you,
Martin