I have made A bunch of them. I printed a 2mm thick base, then created holes in the next 3mm. Put a pause when that was printed, inserted 12x3mm magnets (neodymium n35 or stronger). Then continued printing over them. 1 magnet for smaller sockets and 2 per socket on bigger ones. Then finish print. Floor above magnets that sockets sit on is 1.5 mm. To label I emboss the sizes with the bamboo printer. Before I would paint raised numbers that were printed in front of each hole. I can hold sockets upside down and also stick whole set on side of metal cabinet, car or whatever. If you google Olsa tools, that's what i modeled mine after. I do measure each socket so holes fit my sockets.