Inaccurate cuts on the x and y axes

[RussellCrawford]

@AndreaPregl

I think there is some kind of adjustment that i can’t think of.

That’s possible, try adjusting the eccentric nuts. I just saw where Seth posted about this.
The eccentric nuts keep the V wheels tight.

Different sizes same profile

Make sure the eccentric nuts are also adjusted to keep the machine as rigid as possible… [X-Carve V-Wheel Adjustment]

Also even belt pressure and of course calibration. If you have a mm ruler you can jog the machine 500mm and see if it goes 500mm on the X and Y.
There are a few videos on calibrating the XCarve, PawPaw has one.
PawPaw has some good videos on adjusting and maintenance on the XCarve.