THIS IS A TEST PIECE! The real item is the box for my ELS controller - the very first picture in the thread. The wall where the pocket is vertical. Can't print a rectangular box with no vertical walls. The box has a vertical wall with pockets, just like this test piece. It also has a rectangular cut out which will have supports. The big PLA box printed the pockets ok - I'd be happy if I got the same quality, or even close in PETG.
Ok, so it's a direct drive extruder. Prusa uses a Bondtech BMG right over the hotend so that there's a very short path which means less chance for the filament to buckle, which increases filament ooze when the extruder stops moving. That said, it seems to be laying down too much filament at the beginning of the layer, and the extrusion doesn't look very consistent. It looks a lot like the printer is using "pressure advance" with the wrong settings. I think Prusa uses Marlin firmware on their printer? I use Klipper, so the methods and settings are different. Other factors are how consistent the filament diameter is (shouldn't be an issue with Prusa), and the z stepper motor and screws. Z stepping could be a little off, or the screws could be binding a little. You haven't said how fast you are printing either. I'm curious to hear that.
So I have been loosening my X all this time and seeing little change! Yes, the X belt is significantly looser than before, I have run out of adjustment. The piece is oriented the long way on the X axis, short thickness (3mm) on Y. Well I can change Y... I changed x because it was at the tight end of the setting. Y is currently at belt tension 274 according to the Prusa belt test. X is now at 255. To loosen further, I need to jump a tooth I think. The tension screw is loose, I just pushed the X stepper to the right as far as it would go and then tightened the motor. Prusa suggests the settings are from 240-300.
