Ortlieb Back-Roller Classic Shoulder Strap Piece Replacement

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3271880.

The shoulder peace for my back roller classic from Ortlieb got broken . So I made this replacement, because without it, the strap always slips from my shoulder. It consists of three parts, which can be glued together like I did, but I think it will also hold in place without glue.