It's a very simple adapter to transform a vynil cutter into a pen plotter. I've updated this model with adapters for other pen fillers.
The GS-24's blade location prevents thick pens to protrude abover it, so I made the adapter to just use the inner part of the pen, but you can adapt the design to hold other pens, so long as you make sure it fits when positioned on the plotter.
Printing was done with supports on 0.2mm layer height.
The author hasn't provided the model origin yet.