Pen holder for using Ender 3 Pro as Plotter

This is a pen holder for my Ender 3 Pro, to be used as a plotter. It was designed with the idea to be mounted permanently on the left roller screw of the hot end cartridge.

You will need two M2 screws to secure the pen in the center, as well as two small nuts to slide in the wall (they are not strictly necessary, but to be safe I added them).

The hole for the pen is 20mm wide (diameter), so it will be hard to fit a thin pen inside, that is why there are several pen adaptors (with different diameters from 8mm to 16mm). they have through holes for the M2 screws to pass and secure the pen inside.

I add a "scale" on top of X and Y. THis is to easily measure the X and Y offset.

The X scale starts at the center of the roller screw and ends at the center of the pen hole.
The final offset for the X axes would be the distance from nozzle to center of screw + number of lines to the center of the pen


The Y scale starts 10mm from the metal plank (where my nozzle is) and goes all