This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/9JmYVKMdzrb

Made this to hold some new oil based paint markers that I bought here:

https://www.amazon.com/gp/product/B000GOYAPQ/

These are great markers, I use them to mark wires/pins on connectors/etc.

I didn't add any screw holes, I used a large command strip to stick this to side of my 3d printer enclosure.