Anet A8 Pen holder

A pen holder for the anet a8 to allow it to draw
needs one spring to keep the pen on the print bed
works with up too 14 mm diameter pens
designed to fit where the print cooling fan usually sits

Double pen version: https://www.thingiverse.com/thing:2829649

Update 1
A travel friendly back plate has been added to avoid streak marks when traveling
set the z to go by at least 4 mm when travelling