I´ve made this thing (remix) to hang my motorcycle helmet. I used PLA and it works fine for me. the fist has a tube like hole inside only to make it lighter and use less filament. If you want the 3D file (rhino) to edit it let me know. The fist size as is should be around 8.4 cm (3.3 in) and the base 7 cm (2.75 in) x 11.4 cm (4.48 in).
If you can share a picture. Than you.
Fist_helmet_hanger.stl | 6.9MB |