8mm replacement spacer for Ortlieb QL2.1 hooks.
Use 4-5 perimeters/walls for strength.
I love my Ortlieb bike bags, but I have the continuous problem over the years of losing the 16mm plastic sizing inserts. The hooks have just enough flex in them to pop out while riding (if you hit a big enough pothole). While they don't take the brunt of the weight, they do make the bags more secure while riding.
I've purchased replacements before but I am unwilling to buy them again. After some tinkering in Fusion 360, here's a printable spacer!