The scalable multi-purpose clip.
Fast to attach and remove and can be done so one handed.
This is a small object with close clearances so a relatively well tuned printer will be needed.
Two perimeters/shells work well but if you find that the claw tips snap off of you let the claws snap shut then increase the perimeter count.
What files to use:
Print a A and B side, if you find the fit to be too tight use the loose versions.
If you plan to scale them up use the Tight version.
The Tight version worked well for 150% and 200% scale, bigger then that and it might be a bit loose but should still function unless you go way too big.
Fit the hole over the post with the claws in the fully open position. You will find that the end of the clip with a hole/post has a small point that will catch a little during assembly, this is intended, a little force/wiggle should get it to snap in.
With the claw still fully open wrap the rubber band around the little hooks, try to insure that each loop of the rubber band has about the same tension in it or it wil bunch up as the claw is closed.