Making some circles noticed the dimensions was completely wrong. A 30mm circle is something like 29.xx, also a 60mm circle is 59.xxx. Also, they are a little bit oval.
Checking for steps accuracy, using a dial, I noticed a 0.025mm backlash using the carbide interface to make the steps in 0.1mm increments.
Checked all the screws, tensioned all the belts, checked all the wheels. Any suggestion?
Also made few tests, drilled 8 x 6mm hole in the picted pattern and a 30 mm circle, in the picture the deformation are exaggerated