A kickstand and earphone-organizer for the iPhone 5/5S. It works with a "naked" iPhone 5/5S as well as with the Apple leather cover. Works in both landscape and portrait. Could work with others as well, but no promises. The large gap works OK with an iPhone 4/4S also, but it's not perfect.
This is a fairly iPhone-specific thing, but the general idea should be easy to model for other phones/gadgets as well. The main thing to keep in mind is to make the gap angled (mine is 15 degrees) so it's more stable, especially for portrait use. The Apple-cover makes the 5/5S 9.2mm thick, if your cover is of similar thickness it should work.
This is my 8th revision of the design, they've all been single-size up until now. I keep at least one of these in my pocket at all times, great for watching a video on the train, while eating, with someone else or on your nightstand. Takes up very little space in your pocket. :)
Printed with PLA on a Replicator 2, 5 perimeters, 0,2mm layer thickness, took 10 minutes. Basically massive.