This design is based entirely off of the LunaTik Taktik Iphone case designed by MINIMAL. I really liked their design and I wanted one for my HTC ONE Android phone. The two outside bumper parts are printed with a flexible PLA filament (I used ecoFlex PLA). Alternatively, if you would rather print it in a rigid plastic and then cast it in a flexible silicon that would work well too. You will need two of the "latch" part to assemble this case This design requires eight M3 machine screws 15mm long. changes for v1.1: +Reinforced the screw boss's on both the front and back parts, +Slightly tweaked the buttons to make them easier to press +made the camera holes aligned better