Originally Posted by
Torchhead
I will attempt to simplify: You are losing steps (The motor is not moving one step for every step the software is sending)
IF the DRO shows it moved then the software has sent the pulse to move it....it has no way to know if it actually moved or not. Outlines do not have a lot of rapid up and down moves where as letters( if not flat sides and top) have lots of up and down moves Cutting reliefs in ArtCAM is an intensive process of lots of short moves.
Slow the max velocity and acceleration down on Z. Drop it by 50% as a test. If the problem persists then
Consider using a real controller. The problems with Cheap Chinese motor drivers/controls are legendary.