We needed a hair grip that could be customised for my sister to wear for her wedding. This is the 3D comb part. The back edge is thinner that any we could buy and has the addition of holes to thread decorative parts through.
photos attached of the printed clip, the finished clip and it in use at my sisters wedding.
I printed this on my up printer at 0.2mm layers using clear material. To make it slide smoothly I treated it with acetone vapour, but a good sand using fine grain sand paper (200+ grade) between the teeth should be enough.
If you use acetone allow plenty of time to re-harden to make sure the teeth are strong enough. I left mine for 2 days before it was hard enough.