Pen Holder for Fully 3D Printed Small CNC Router/Plotter

Here is the pen holder and stand for the ["Fully 3D Printed Small CNC Router/Plotter"](https://www.thingiverse.com/thing:3842401)

It will fit fat Sharpies, Ultra Fine Point Sharpies and the Pentel Energels in the pictures. Really skinny pens may require longer screws.

See PDF for print orientation. I used 4 perimeters for the pen holder parts, just 2 for the stand.

The spring is a #156 from Ace Hardware cut in half. It has a 22.5mm OD., 72mm length., 0.86 dia. wire with 9 turns (coun