Here is a pack of 8 iPhone 6/6s cases! All of them are easy to print; NO supports and NO bridges! Just print with normal settings! Enjoy!
The cases may not fit the phone right off the print bed. All filaments contract differently when they cool. If the case is too big, print it at 99%. If the case is too small, print it at 101%. If the case still doesn't fit, keep scaling by 1%.
Just use your normal printer settings!
Sometimes a little bit of stringing is left, so I just bought a tool that is like a pen with a tip that heats up. It's pretty cheap. Here's the link:
First I created a plain iPhone 6 case template. After that, I came up with different designs using different, simple, shapes.