3D printing was a game changer for me too. For me it all started because I wanted a Flat four engines for my Sand Scorcher. After chasing down a cast replica from the 1/8th Kubelwagen, seeing all the work I needed to do to make it look right... and then realizing I wanted 3 of them for the other SRB's I had. I realized 3D printing a engine would allow me to easily make as many as I needed. One thing lead to another and I now have a small business designing and selling 3D printed parts. The ability to make and share your designs means there are some really cool parts out there from all sorts of designers that would have never seen the light of day before 3D printing. Mokie Kagaku is right, we are only just starting to see the potential of 3D printing - I too look forward to the future of it all.