Sunglasses Holder for Car Sun Visor

This sunglasses holder is strong enough to stay on the sun visor even when the sunglasses are in place and the sun visor is down (or at least it does in my car). The grooves in the design help the holder grip onto the sunglasses.

This is not a remix, although I did draw inspiration from Drotron's (https://www.thingiverse.com/drotron/about) sunglasses holder.

This is design version 1.0 and I plan on improving it so please comment ideas on how to make it better.