As I said, I do that only as a hobby and because I have enough free time right now. Nothing worth getting in trouble for!
And if anything happens, I can always go back to the original straight tube shape that worked great and that has nothing to do with IPD patent.
(the only reason I used a wedge on the new version is to stiffen the 3D printed part. It's not needed for the aluminum part).
I went to the foundry yesterday, and I think I can do an aluminum part for a price close to the 3D printed part, the only difference is that I need, like the shifters, 10 or more person that want one to start.
I'm not done with all the costs yet so I can't tell you a price. Should be around 300$.
Also, I found the datasheet for the 3D printed material:
https://www.shapeways.com/rrstatic/material_docs/mds-strongflex.pdf
The plenum operates at a temperature way lower than those value, so it's safe.
If you are interested in having one in aluminum, you can send me a PM.
Thank you!
Ben.