I built my 3D printer a couple of months ago, but I can't get it to print sharp corners. The corners in the picture should be 90°, without any fillets:
During this test print, I played with multiple parameters: speed, temperature, acceleration, junction deviation, linear advance. All of these were also individually tuned previously. Nothing seems to make a difference.
Could this be a issue with the construction of my printer? I'm beginning to think my hotend isn't rigid enough, but then I would at least expect better results at low speeds.
Edit: the printer is a CoreXY of my own design running Marlin 2.1.2.1. The Slicer is PrusaSlicer with most settings left as default (but increased speeds)
I can only add 2 things that I know of here that could help.
#1.Try a linear advance tune. That alone should give you sharper corners and more consistent details at higher print speeds.
https://marlinfw.org/docs/features/lin_advance.html
#2.A direct extruder can help with getting very precise sharp corners but from what I understand it will hurt with accuracy on curves. Also there is the whole fact that there is a motor on top of the hot end so weight and whatnot will hurt speed.
Anyway just check out #1. It should help with your issue. If not that then a feed rate tune would solve any over extrusion problems.
Regarding #2, not having to sling a 1-2lb bed back and forth with the CoreXY construction should cancel out most any loss from using a DD extruder.