It was a while ago, but I did print these out on a 3D printer and even posted about it. I used the CAD file Greg has to print them. mostly as a proof of concept, rather than for actual use. My business partner is the one who knows more about the different 3D printing materials and was the one who printed them. If I remember correctly, PLA was better than ABS, especially if it was going to be exposed to the Sun quite a bit, as it is more UV resistant.
How did the printed versions work? Any issues or call outs?
Other than seeing if the CAD file was viable, I never did a test fit, as I do not have the GSXR mirrors, nor am I planning on using them. My partner advised against it as he did not do a lot of "fill", meaning their density wasn't going to be capable of much support. Theoretically, we can still try making some, I'd just have to buy the right material and confirm with my partner he has time to do them again.