Backpack helmet holder hook

prusaprinters

A hook, that can be used to hold a helmet to a backpack. I designed it to hold a climbing helmet to the Lowe Alpine Airzone Trek 35:45, since I am not a fan of those fabric helmet holders you can buy. I used a piece of 2.5 mm elastic cord that is jammed in the hook with an overhand knot and at the backpack with a fixed loop (bulin). This backpack has two loops that are perfect for this application, others may not have fitting mounting points.I also uploaded the open scad file, so you can change the design to your liking. Some properties, like the size of the hole for the elastic cord, are parametric and be changed easily.