I’m currently facing a weird printing quality issue that i can’t seem to wrap my head around. Printer is an off-the-shelf OrdBOT from RepRapDiscount which printed quite well so far though i haven’t had an eye on high quality during the last months. In the build process of my new Eusthatios now i saw that smaller holes/rounds up to around 20-25mm in diameter show weird deformings. See the picture to get an impression. This is a test part with 25mm diameter and different sized holes. You should see that the circles and holes aren’t really round but have quite a few flat parts - especially a bigger one that seems to happen in the same place over and over again. Good news is that this error doesn’t scale. It only matters on diameters up to max 30mm - on bigger roundings and circles this doesn’t look so bad (see other pic)
I’ve already checked pulleys (i even changed the for new ones as i had some lying around), belts, movement of the makerslides, cleaned the makerslide wheels, checked and reset belt tension and all that other stuff. I also changed slicers (currently mostly using Slic3r), lowered speeds, accel, Jerk and everything else that came to my mind.
I’m a bit stuck mainly because i managed to get such issues worked out quite quickly in the past. Probably any of you guys does have a good hint? Any help is appreciated! Thanks.