Update 10/12/20 STLs reloaded - I had previously downloaded them with the wrong units making them appear tiny.

I decided to create a new Z axis based on the Y and X axis design to lift the pen out of the way rather than rotating it. I found rotating the pen left little strike marks on the paper. I also added a different pen holder. The pen holder design uses M3 self tapping screws to hold it together and an M3 bolt to hold the pen in place - I had to run an M3 tap down the bolt hole post printing.

It reuses the same gear from the X and Y axis.

Infill - rail 20%, slide 25%, pen holder 25%

Creality

Ender 3 Pro

No

Yes

0.2

20-25%