Wall-mounted Helmet Hanger
thingiverse
This is a hanger for helmets, and should work for both bicycle and motorcycle/racing helmets. I printed mine in PETG and affixed it with 3M 30-lb outdoor mounting tape. I found that 15-lb indoor mounting tape failed after about two weeks holding up my motorcycle helmet, but might be sufficient for lighter bicycle helmets. Your mileage may vary here depending on the surface on which you're mounting this. I also did a test print in Inland PLA+ and it held up perfectly fine - so you might be able to use PLA here if you're not storing the helmet in a location that gets particularly warm.
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