After looking for a clip to attach my wallet to my sun visor, I found nothing that matched what I was looking for, so I drew one up in fusion 360. This is my third version, the first two did not print to my satisfaction.
I've attached the .step file if someone wants to modify it, but I don't know enough about Open Scad etc. to make it available to customize in the typical way on thingiverse.
I have printed it in PLA for now, but eventually I plan to go with PETG due to heat resistance and better flex.
I've added a version that will take thicker wallets etc. (v5)
3 shell layers printed, no infill.