I designed an over-the-door hanger for my helmet as I had seen most companies have them screw into the wall or door and I want to add as little stress to my landlord as possible. I had seen companies make a few that were over the door hanging racks but were metal and… I have a 3D printer so why not make my own. The shape on the hanger was inspired by some of those hangers in that it should cradle the outer shell of the helmet well and also protrude up into the helmet to stabilize it.
I printed it with the BBL PLA Basic in Bambu Green that BBL sends you with their printer (P1P). I used adaptive cubic and 0.2 mm layer lines initial and throughout. I did 5 wall loops, 5 bottom and top shell layers and 25% sparse infill density.
It prints on its side so it doesn't need supports. I designed it around a door that was 34 mm thick but with the clip there is a little nub at the end that lets it adjust to slightly different thickness doors although I don't know if I would go much past a 36 mm thick door as the bridge at the top is only 35 mm. It may stretch to 36 mm but I wouldn't push it given that your expensive helmet is mounted on it.
The bridge at the top is 3mm thick, if that is too thick for the spacing in your threshold it will not close, mine is mounted on a door we keep open at all times anyway.
If you have a request I can adjust this to be thicker or thinner for your door/gap but can't promise that less than 3 mm for the bridge would be strong enough to hold the helmet using PLA.
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