While cleaning up the warehouse, we tripped across this cache of Openbeam aluminium 15x15mm construction extrusion, in various colors, various lengths (from 1M down to 240mm).

This is beautiful, and useful. We’ve built a few machines using it using both ABS and aluminum brackets with 3mm hardware, including the bulk wire-winder, wire cutter, robot chassis, and screw counter.

The profile is open-source, and there’s a good assortment of 3d-printer compatible fixtures you can use it with! Come on into the store and grab it while it’s still around! (Sorry, not available for shipping)