I know several services in Europe that are accepting bitcoin payments for 3d printing, maybe they can also make prototypes.
Gobrrr is one of those websites based in Austria, and I just confirmed they are doing what you are looking for.
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Cut production times in half with rapid prototyping. From idea to printed prototype in less than two weeks. The days of expensive molds are over.
https://www.gobrrr.me/ PS
I can't remember alternative options right now, but maybe I will update this post later with more information.
They also look good - and speak German, a plus for me
Will contact them tonight, thanks a lot!