Glad to see this project, as a designer of 3D-printer，I don't think that's a good time right now. As the 3D-Printer hasn't been applied widely, and too few industries to use, so No need to use a blockchain.
But, this mind is very cool, so just do it.
Thanks! We've seen the success of Sirin Labs and feel we have a good chance of creating something at that scale and possibly larger. We plan to also launch a pre order for one of our 3D printers in the coming days.