How about a Modified Mendel Max using OpenBeam?
Here's one:
http://www.thingiverse.com/thing:33946
I have been trying to find some photos of a full-on OpenBeam Mendel (
http://www.hive76.org/modified-mende...ing-wednesday), with only the injection molded OpenBeam components used for framing. This would allow you to build up from components without the need for a 3D printer to make the framing components.