Thanks everyone, I got a lot out of this build from a material properties point of view. These 3D printed parts are pretty strong on compression but they are terrible in tension along the layer lines. As long as you orient the prints to avoid layer separation, I think that 3D prints would be viable for single use tooling and fixtures for our hobby. I also think this stuff might be viable for making former plates for copper boilers. I need to give this some thought.
Tony