How it's made. Each piece is a flat 4-4.5 mm plate made face-down, so the face comes off the bed glass-smooth. The formula is set from real mathematical type, and its picture, its name and your line are set 1 mm into the face in a second color, flush with the black. Engraved cuts the same into a one-color plate instead. The back takes a slot-in stand (a separate piece), two keyholes for screws, or pockets for 10 x 2 mm magnets. PLA, no supports.