The file 'Motorcycle Helmet Hook – Hanging & Wall Mount, Two Models 3D Printer Model' is (SLDPRT,STL) file type, size is 735.6KB.
I tried a helmet hook here, it didn't hold the helmet securely. Printed this larger one, hopefully it turns out well
EDIT 03/19/2019
I printed both models and they hold the helmet very securely. I am going to do some slight tweaks, I will make the flat larger than 110 mm, and the hooks on the hanging version shorter for goggle clerarance on off road helmets
hanging_helmet_hanger.SLDPRT | 321.9KB | |
hanging_helmet_hanger.STL | 372.9KB | |
Motorcycle_Helmet_Hanger.SLDPRT | 217.3KB | |
Motorcycle_Helmet_Hanger.STL | 189.9KB |