I'm searching for a free or even a full trial (must be able to save or print) CAD/CAM program. The reason is that me and some others are building a completely new engine, and I need to make a working model on the computer to solve any "errors" that can come up. This way less errors when actually building the engine. Also if the program supports a direct up-link to a CNC milling or lathe machine would be even better (so we can actually just build the parts needed). I was thinking of getting A-Cad at first, but remembered that last time I used it was back in -96 so it's been a while. But that supports some of the features above. Need a program with precision. Oh, and if anyone knows (or has) a program that can tell you how to build an exhaust system for example a block-4 or V-Twin engine it would be even better. Does anyone know where I can buy "Electronics Workbench" from (new, not used or similar)? And no E-Bay stuff please. Thankful for any replies given.