[michaelt]

There are existing similar-ish products, for doing things like engraving drinking glasses, lasering barcodes onto cylindrical products, customising travel coffee mugs and things like that. For cheap marking lasers this is called a 'laser engraving roller' and for big CNC mills it'll be called something like a '4th axis' or '5th axis'.

This is a super neat and cool project, but someone who knows a bit about CNC control - as the author surely does - will have sources of inspiration to draw upon, and won't have to solve every problem from scratch.