Sethmoser - just want to say you've done a great job with this design. I've printed out a few iphone 4 and 5 cases and they've worked great!
Everyone - I actually had some free time and attempted to add an iphone 6 case to this which you can check out here http://www.thingiverse.com/thing:813330. It will fit OK, but its not great yet (still making some tweaks). Would love to have a few of you print it out and give some feedback and suggestions!