For calibration see:
Usual causes of the machine going off-course when cutting:
- high tooling engagement caused by trying to cut a slot as narrow as the tool, much deeper in diameter than the tool — add geometry and cut as a pocket down to tab height or the penultimate pass
- mechanical issue — check the belts, belt tension, pulley set screws, and linear motion setup (eccentric nuts/V-wheels, or linear rails/blocks/lubrication)
- mechanical interference — usual culprit is the dust hose
- wiring issue — check that all wiring is in good condition and all connectors are secure
If you continue to have difficulties, post your .c2d file, step-by-step notes on how you are securing your stock and setting zero relative to it and managing all tool changes, and a photo showing an attempt at cutting still in place on the machine here, or to support@carbide3d.com