I usually design things in Sketchup to print stuff on my UM1 or UM2. The designs are always accompanied by their source files for editing and a collada file for printing but if you want a particular format, just ask.

Winner of the TinkerCad/Makerbot chess challenge, author of 3D Printing Blueprints, and all around cool guy.http://joes3dworkbench.blogspot.com/