Had these laying around for a long time now... The plan was to use these parts to extend the chip contact at the end of the filament cart to on top of the printer and use external spools. Could then program the chips and pop it on the contacts when I was swapping out material. Spent a day designing, printing, and building then decided to flash the FW. I included the 123d models as well if you want to fix some things since this was just the initial design. It did actually work for me but the contacts inside (the printer and cart) were a little touchy.