We use this in our hackerspace in the mini-shop holding Arduino's, Raspberry PI's, breadboards, Sparkfun-kits and other fun. It's a two-piece assembly that snaps together with a small lock. Just print out labels that are 50 x 23mm and put them into the sign. There's also room for putting a plastic sheet of similar size in front of the paper piece to make it last longer and look more professional.The structure is hollow to save filament and this also allows you to put something inside for weight. The two parts are press-fit and weigh less than 5 grams. Walls are 1 mm thick so they're easy to print with both 0.5mm and smaller nozzles.I've also added the Rhino-file in case someone want's to modify it. This has both the booled and unbooled elements for easy modding.