Cool coffee cup CNC

I like this CNC, you stick it on a coffee cup and it draws  on the cup.  Its still a work in progress.  But seems impressive sofar.

https://www.thingiverse.com/thing:3028775

https://hackaday.io/project/158014-mug-o-matic-a-modular-tiny-cnc

Building Hope With The Mug-O-Matic Modular Toy CNC