Coffee Coasters - for all ages

This coaster will need two additional pieces of hardware: a 4" (10.16 cm) acrylic disk and a 4.5 mm (0.18") steel BB. I found it’s even more fun to drop 3 BBs in there. I glue the acrylic disk with some UV resin but sticking it down is purely optional.

The outer ring fits all coasters; it’s a press fit and quite tight. It holds the acrylic disk in place, so the glue part is optional.

It’s not just fun to play with but also very functional as a coaster. It’s especially nice if you use glow-in-the-dark or color-change filament for an extra cool effect!