Small desktop pen holder for Sakura Micron pens with optional extras

Vertical desk holder designed for Sakura Micron pens. Holds 24 across two tiers. Also Rotring Tikky, though they stick out a little higher. Holes are 11mm wide so anything else with a barrel that size ought to work.

Optional extra holder sections on either side and at base, intended for holding USB thumb drives etc.

This is a revision of "Desktop pen holder for Sakura Micron pens"