Lazy? Me too. I thought I'd pass along this layout if you want to print Thing-O-Fun's fantastic differential design in one shot, without having to do all the set up work. One color each for left and right extruder, and if you want to print the whole thing monochrome there is an STL for that too. One of the files is modified, the original "Side.stl" file has an inner hole diameter that is too narrow, so I made a new matching part with that problem fixed, which saves you the work of reaming out that part after printing. Enjoy, and thanks for your great design Thing-O-Fun!