Y axis slips
Not really a new issue, I have printed many objects before this with the MK2.5S with no problem, but now getting Y axis slips ( again - had it a couple of times before the MK2 to MK2.5S upgrade ). About 10 mm up, I got 2 slips of about 5mm each on successive layers. See photos. Have checked motor grubscrews, belt tension, motor mount, all the obvious things, but nothing mechanical wrong that I can see. If I use the manual settings to hold the Y axis, cannot move it manually - its locked tight, as I would expect. And if I turn the power off, the Y axis travels smoothly with normal hand pressure from full foward to back, with no tight spots or any problem. I am still a bit suspicious of some lurking bug in the stepper motor drivers, but cant seem to pin it down, and its certainly not reproducible. Any thoughts ?
One more note: I have aalways used "silent mode", ie low power. Will run another print at "high power" to see what happens. Saw this mentioned by someone else having similar problems.
I had Y-axis skipping happening consistently happening on one specific print, it was 160 x 160 x 3 mm with several dozen holes in PETG. It would pick up and set down hundreds of times, get stuck, then skip the Y belt and break free. I tried increasing temps to no avail, and then tightened the Y belt 1 tooth, which got me through that print.
Try changing the belt tension by 1 tooth. If you tend to run tight belts, try 1 tooth looser, or if you already have the belts nice and loose, try 1 tooth tighter.
Otherwise, maybe one of the linear bearings is acting up from time to time? Possibly a damaged ball or trapped dirt jams it up occasionally?
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Thanks for the suggestions. I would have thought that a belt slip would be by 1 tooth length, ie 2.5 mm, or perhaps a multiple. Mine are more like 2.3, 4.6 and 8.8 mm. Belt tension seems good to me. The bearings and rods are new ones done in the MK2.5S upgrade. Y carriage movement is absolutely smooth over the full travel, so I doubt its dirt or bearing damage.
Changed the power setting from 'silent' to 'high power'. Completed 2 prints on the part I had problems with. Worked perfectly. Much noisier, but I can live with that. Will continue with 'high power' setting.