Random thought: if one attached a pen/pencil/marker to the collet, set the rpm to zero, and the actual Z so that the bottom of an engraving cut would be the surface of the stock (in this case, paper taped on to the table), one might be able to make some neat looking print-drawings. Like what these can do:
Or, again, in theory, a laser attachment could make this a laser cutter…
Again, not about to do this tomorrow! Just had to dump this somewhere to get it out of my head.