Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1175676.

EDIT: updated the design

this is a gopro mount for my specialized fatboy. it can fit forks around 50mm in size (some fatbike forks taper so it might still fit just at a different height on the fork)

2 zipties and you might want to put some sort of sticky/adhesive thing under the mount between the fork to help it stick in place incase it shifts (like some rubber tape)

you want to print this standing on its flat edge as to use the least amount of support material and to increase the strength of the part in terms of how the gopro mount fuses into the part while being printed.