Nickorossa
Registered
All the ones I've seen are flexible.Hmm, I never thought it should be flexible. The couple I saw on other divers are pretty solid, I guess it would be better if its flexible?
However it could be printed in TPU. To get the dimensions right to work with the flexibility of the material would probably take a couple of prints.
The time to design it would be a few minutes; however given that to buy them is about 6GBP, or 10USD; it would just be easier to buy them.