I needed a spring clip to hold drawstrings closed. The Bread bag clip by RyGuyDesign worked great, but I needed a smaller hole because it didn't close tight enough. I also did not need it open, so I closed the top as well, for added strength. I used his loose tolerance model, and made version with a 10mm hole, as well as one with a larger 13mm hole. I printed in PETG, but other materials could be used. Thanks RyGuyDesign for the amazing print-in-place design!