Pen holder & pen insert (Bic 4 colour pen)

This is a pen holder and insert to hold a Bic 4 colour pen on my i3 clone printer for general plotting and writing.
It uses an M3 bolt to clamp to extruder mount.

My extruder x-carriage is www.thingiverse.com/thing:547706

There's a YouTube video of it functioning here: https://youtu.be/yK_YGwMRR40
My software and source code is here: https://github.com/boy1dr/3DWriter
Fonts include single stoke cursive handwriting, some Japanese/Greek/Cyrillic characters.

The printers name is 3dp0 (3