The iPhone 5s gear case by BrandonW6 is amazing. Located in source files and at: http://www.thingiverse.com/thing:79606 It is the ONLY iPhone 4 or 5 case on thingiverse to fit an iPhone without modification! However the gears are way too lose on the pins and literally slip out of contact from other gears. The linked case includes 3 sizes of pins. I have made 3 sizes of pins with the correct thickness to fit the gears and still maintain the previous thickness to fit into the case body.Print with 85% infill because pins are important. 1 shell .27mm laywers. 60mm/sec worked for me.