This is a remix of http://www.thingiverse.com/thing:190238 What did I do? I made it printable on the stock 100mm x 100mm x 100mm bed of the Simple. You will need some extra hardware. You need: 6x M3 Hex Nut 6x M3 7-10mm screws 4x 4" Zip Ties Super Glue (Optional) Please note: I have no tried this yet! My supplies will be in in a few days. I will update to confirm that the print works in a few days. There are small notches in the main piece that line up with the end pieces, these are "keyed" so you can't mess them up. It's pretty obvious how it goes together, but it also makes it so you don't need glue (Though I would recommend it) I am currently finishing the new version with middle supports. It will be up soon in addition to the standard one. You may choose whichever you like. Michaeli, the original designer, recommended I add extra supports. To attach the GT2 belts supports, just align the notches (these are keyed just like the other pieces), place zip ties through the holes, add a dab of super glue, and tighten everything. Download all the files from http://www.thingiverse.com/thing:194686, but do not print the supports, only print the motor mount plate, 2 bearing caps, and 2 tension blocks. Follow installation instructions from that. The assembly is the same once you have my parts attached. The measurements from Jon's GT2 ends should match mine, though they're nicer looking! Don't forget this is still a WIP until I can check everything! Thanks!