This detachable pen holder allows you to use almost any 3D printer as a pen plotter. It's compatible with Three Ducks in a Bear Suit's Prusa Mini Pen Plotter design and should attach to any BLtouch mount.
Just swap your usual BLtouch/CRtouch M3 bolts with longer ones (if needed), place the plotter mount on top, and use M3 nuts to secure the plotter mount.
The author remixed this model.
I designed a part that should fit on any 3D printer with a BLtouch mount, along with a shortened version of the pen mount that sits flush with the new mount.