A Galaxy Note 3 case, made for Flexible filament, like Ninja-Flex. Borrowing from 2 other designs, I've combined the best of both.... corner bumpers and soft keys for the power and volume. Thanks to mming1106 and BreadMaker for their models I've mixed.
http://www.thingiverse.com/thing:240113
http://www.thingiverse.com/thing:2269951

Ultimaker

Ultimaker 2

No

No

.25

100%

Used Simplify3D slicer to print layers 1 thru 28 at my best Ninja-Flex temperature, 240ºC. Then set it to change temperature to 225ºC for layers 29 thru 40. The cooler temperature pulls the ninja-flex tight over the tops of the speaker/power holes and keeps it from sagging down. Then I returned to 240º for layers 41 up.
Build plate 70ºC