this project is designed specifically for the makerbot challenge on Grab CAD. i spent a few hours outside of work designing it, overall it took about 6 hours, not including render time.
it is completely ready to 3d print, with maximum 2mm wall thicknesses and all parts within the given bounding box
STL (Stereolithography, filesize: 5.9 MB), OTHER (Other, filesize: 23.1 MB)