OK so it can do clear plastic, that's good to know.... the ridges are a no-no so, too ugly, defeats the purpose...
Maybe make a little mold instead, and and poor that same clear plastic the printer is using, by hand into the mold.
I could make a mold (metallic/ reusable) of the "unfolded" clip, the exterior part of it, which is what you get to see. That would make for a flat surface for the inner part of the clip, but it's probably what it is anyway and if not... well who cares as you don't get to see it anyway, and it would still be plenty functional.
Then I could to fold it back onto itself, to "close" it, give its final shape, I could just apply some gentle, controlled heat using my hot air station to soften it in the middle, just enough for it to want to bend into position.
Metallic mold don't know how to make... I guess once I have made the CAD model for it, I can get it done easily by a DIY/consumer grade CNC machine, or just get it done by a professional shop somewhere.
Yeah sounds like a lot of fun, a nice winter project...