This is the Ultimate iPhone Gaming Controller (now with universal design uploaded as well)! It is designed to fit the iPhone 7 (without a case), and should also fit the iPhone 6/6S (not tested). It provides the perfect ergonomic handle for using your phone in landscape orientation and can keep your phone from overheating! The controller does not interfere with any of the iPhone's buttons, speakers, or ports.

UPDATE: There is also a "Universal" design uploaded. It uses a clip that snaps into the square opening on the front at different depths. The clip isn't super tight, so maybe you can come up with a better design! The opening in the front is just a 6mm square.

There is room for a common 40x40x10mm cooling fan to snap in. I used the one that came stock with my Maker Select printer and spliced it into a 5V USB charging cable. It keeps my phone much cooler than without, but I may add a 5V to 12V booster to bump up the power.

The notch out of the front face is to add a capacitive touch trigger to be able to map to buttons on the screen such as with Rules of Survival. If you want to design something else to fit in there, the hole is 6x6x20mm.