Assembling the original Bambu Lab scraper is a pain because it's hard to hold the thumb rest in place. I added a tab to the bottom of the thumb rest and a slot on the handle so it won't move around when screwing it together. Also, I split the handle into 2 files for 2 color printing. Load the Handle & Handle Logo together and say yes when asked to “Load files as a single object with multiple parts?” The thumb rest can be printed separately.