To do multi color you'll need to look at the layers in your slicer and figure out when to switch filament. I glued the center to 1 side, then glued the flash drive in place before gluing the final side. This allowed me to make sure it was exactly where i wanted it. Used a mini screw eye from a frame hanging kit for the actual keychain part. Cut the heads off 2 finishing nails and heated them up and pushed them through the final 2 holes for re-enforcement on the key chain.