How it's made. Printed in PLA, top-down with no supports: 2 mm walls, a 2.4 mm top with a rounded slot, and 3 mm of clearance around the box class so any brand's cube (about 112 × 112 × 120 mm) or regular box (about 224 × 116 × 90 mm) slides in. The building block has sharp corners and eight studs (four on the cube) in the brick's own proportions, printed flat and set into shallow recesses on top. Dots are 8 mm holes cut through the walls; slats are shallow grooves ringing the sides; both stop for the band around your word, which is set 1.2 mm into the front and filled in the second color.