cnesan wrote:The variation of the surface of one side is 0.3 mm. +/- derived from the sum of variations in the thickness of the support.
When mounted on a basket I did, a basket variation is also added. The sum of the variations is enough to break my engraving cutter.
I don't know what you mean by "When mounted on a basket I did" but if you have a table with so large variation you should fix that table and level the machine properly and mechanically. Using auto leveller is not fixing the problem, just hiding it. If you can't level the table then you should fix a piece of waste material, i.e. MDF, surface that area so that within that are you have almost no variation. After that you can start making PCB without auto levelling.