I wanted to share my design for a 3D printed hole saw stand in hopes that it might help someone out. Basically just a fancy version of the holes-in-a-2x4 method. This stand is based around the PMW hole saw arbors. The rear row has clearance for 2" saws while the front row is capable of holding1.5" saws. There are additional slots for both extended hole saw arbors (7 1/4" x 5/8"-18 & 7 1/4" x 1/2"-20). https://www.thingiverse.com/thing:5534997
More of a part organizer than tool organizer, but I figure this fits with the topic. Might be useful for someone. Full disclosure I saw this from Acoustic Cycles, so full credit to him.