Made this with Tinker Cad because the strap buttons on my Strat were very small and kept letting the strap fall off. After a couple of designs, this was the final model I came up with. It's not perfect, but it keeps the strap on, and I've had no problems so far. Would recommend printing with PETG-CF on a 0.2mm layer height or lower if you can; the images are of a 0.18mm layer height.