Designing a simple photo frame. I wanted to make it so that it prints without supports. While printing, however, the back support part wobbles/vibrates with movement, and is printing terribly.

Ender 3v3 CoreXZ, PolyTerra matte black filament, using the CR-PLA Matte profile in Creality Print 7. Tried printing at slow speeds, the issue still persists.

I've tried making the back support with only 45 degree angles (previously it was an x diagonal), made it thicker (from 0.75mm to 1.5mm). Nothing is working. Please find the stl and 3mf here (https://www.thingiverse.com/thing:7281179).

Is this a printer issue, a model issue, or a slicer issue? Please advise.

Tried printing the frog from this set at 75% scale, and it came out like this. The original 3mf for this one doesn't include supports. What should I adjust on my printer to get better overhangs without supports?

Added a PEI plate for my Artillery Genius using bull clips, and after leveling the leveling/adhesion test print comes out like this. Is this just me leveling the bed too close to the nozzle, or is it the pei plate not heating up as much as the original glass bed? It's at 60c btw

I was having serious leveling issues with my Ender 3v3 (https://programming.dev/post/42345126), and I tried so many different things like probe calibration and even total factory reset before I finally figured out what the issue was. The z axis camera mount that I added. https://www.thingiverse.com/thing:6702771. Taking it off fixed the bed leveling issues right away, and after wasting half a spool, I'm finally able to print my rookie designs. Thanks for all your help and advice! I'm so happy to see such an active 3d printing community on lemmy.