Simple bag holders for the carts. Got them numbered 1-8 with QR codes, allows you to scan the holder rather than to the tote. Allowing you to put your stickers anywhere and have a central location to scan. The thickness of qr code and number plate is just right for uv resin, expoxy and other resin would work but because I resin print most my part, its more compatable and plentiful. Should be printed with black and filled with white.... The AI scanner was only trained on white QR codes..... Shocker..... At least from what I've tried so far. Required HardwarePer Label (8 total):1 2m*8mm screw1 ~3mm thick hook Link~.1-.5ml of colored resinOptional: Double stick tape, recommend some thin stuff*, but any would work.Assembly InstructionsPrint the partsFill QR code and backingSand flat, careful to just get it, the layer is thin.if using UV, any overflow past the base level of the infill parts will be liquid, sand and cure often.Install the hooks, can be done in place or pull off the rubber and slip it into placeClip onto the cart.If using tape, this would be when yah stick it on and then clip it on.