Alright I figured out the problem. The gear was pushed too far into the motor shaft which made the belt hit part of the shafts. I put them a bit lower and now its functioning ok.
Posts made by gimmetheloot
Changing one axis affects other axis
I got almost everything running as it should (with EleksCAM), but I got one last nagging issue that I wasn't able to resolve so far.
When the machine goes into one direction, for instance, 20 x+ steps, and I then go back 20 x- steps there is a slight deviation on the y-axis as well, which means the line does not completely line up, here's a sketch of what I mean (top is what happens to me, bottom is what I expect):
Some things I have tried:
Loosening/Tightening the belt (it gets even worse when the belt is loose)
Loosening/Tightening the top plate
Cleaning the shafts
Any other ideas? Thanks in advance.