* engineering time to program each individual QR code from 2D to 3D
* set up time for the machine (as its probably not a dedicated one)
Wouldn't this be pretty straightforward to automate, as a CNC by definition is controlled by a regular computer? Even the set up time could be made minimal if you could insert a whole batch at a time?
(I have no idea so I'm just making things up here, but am genuinely interested.)