My mother's employer provided her with a professional USB drive, but without the small cap. I tried the existing models, but they were far too wide, and I was looking for the same slightly snug feel as an original cap. So I designed my own. For your information, it took me nearly 15 attempts with different dimensions to get the size perfect; it was a matter of +/- 0.1mm. And since all our printers don't have exactly the same precision or tolerances, you'll probably need to experiment with adjusting the proportions to get something functional. A raft or brim is recommended, but for me, it worked as is.