Wall Mount Pen Holder

I wanted a wall-mounted pen holder, to hang next to my colour-in poster of Berlin!
This is designed to fit pens with a diameter of 10mm, and will hold 16 pens.
There's a 0.1mm clearance between the support strut and the top grid - you can scale up the base if you need a tighter clearance.
Not strictly a remix of the Cubistand http://www.thingiverse.com/thing:1294085 as it was designed from scratch, but definitely borrowed heavily from the concept.