I'm the only person, to my knowledge, who is designing and printing rings. I wasn't going to release the design until I was happy with the performance, though. Stock rings are quite floppy. I've tried about fifteen different iterations, so far. I can get original range, but the magnus effect causes them to always hook to the right. By the time they hit the ground, it is up to about ten feet from the straight line.
You've got a heck of a head start on me then. I'll still be trying to design my own but if you need a beta tester I'd be happy to help. I've got a couple of vortex blasters lined up for purchase from a local collector - a tornado bow and a tornado x2 (pistol). Maybe they'll behave differently on a different blaster.
Have you ever tried printing in TPU? That should check that floppy requirement. I've been looking for an excuse to buy some for a while. I think my printer will need a minor mod or two before it'll accept it though. Do the rings hook consistently? It'd take a little more practice but that could be a helpful trait if you're trying to tag someone hiding behind partial cover.