This plastic insert fits into the hole of the Dollar Shave Club razor to personalize your razor with a specific colour insert (white and black inserts shown in picture.) Great for when you have more than one guy in your place who shaves and you're sharing a Dollar Shave Club account. Insert is held in place with back piece which snaps into it. Print at 100% fill, 20 mm layer Top part will wiggle down into the hole in the Dollar Shave Club razor, then you just snap it in with the bottom piece. The bottom doesn't fit super flush like the top. Might need a dab of crazy glue, but my printer was able to print it such that friction alone seems to hold the snap in place.