This is a sharpie holder that mount to a Duplicator i3. may be adaptable to another printer.

I included the Fusion 360 files. I designed this back in 2017 as an attempt to draw circuit board with my printer. Drawing circuit board was a success, but etching PCB with chemicals was a fail.

You need to take out a small spring from a pen and put it between the cover.stl part and the sharpie_top.stl part.

used in pair with my PCB bed holder : https://www.thingiverse.com/thing:4598910