If the overlay is losing alignment between cuts, it means the position of the camera has changed relative to your workspace.
You must make sure that your camera is mounted in such a way that it cannot move at all relative to your workspace, or the overlay will lose alignment.
If you switch to a material of a different thickness, that can also cause a misalignment, as the distance between the camera and work surface will have changed.
You can perform an alignment for a given height by engraving the alignment marks at that height. Right-click in the camera control window and save that alignment information. Then, perform another at a different height, and save that one too. If you name them for the heights they were done at, you can import camera settings for the closest height to whatever you’re engraving.
The slant should be corrected for during the calibration and alignment process. When you perform the calibration, make sure you’re getting low scores and that the dot pattern is perfectly flat. If there is an curvature to the pattern, that can throw off the calibration.
Here are some additional tips on the lens calibration and alignment processes:
And video guides:
