Works with a micro:bit v1 or v2. Note that the edge comes very close to some small components 10 mm from the edge of the board, but shouldn't touch or interfere unless your printer's Z-scale is incorrect. As ever, take care fitting anything to a circuit board …

tiny guard piece to stop croc clips / alligator clips shorting out on your micro:bit. Designed entirely from the Kitronik mechanical drawings, as the official ones are useless.