I made this holder, because the graphite tip of my adjustment compass always seems to go dull after a few uses and i dont have a sharpener small enough for the tips. 

This this model specifically made for the Muji Black Gel Ink Pens with a 0.38 tip and a Rotring Rapid Kompakt adjustment compass (SO676580). 

The pen should slide right into the holder and does not require any additional securing.

Muji Black Gel Ink Pen

Adjustment compass

Additional Info:

The model has chamfers on the edges, which can be difficult to print. That's why I also provide another model without the chamfers.