I liked this cellphone stand www.thingiverse.com/thing:2506070, but I needed to edit it so I could use it with my Otterbox case and I wanted to make the back support higher.
Special Thanks to Axser for the original!
I made a version with and without side supports.
I wanted to make it so it was easy to use any charger cord with it with a dab of hot glue to secure it from the bottom. To make sure it is placed in the right position, connect your cable to the phone, put the phone on the stand in the proper position, lay the stand on its back, and then glue the cord in at the bottom.
You can probably get away with making the stand wider or thinner by changing the height of the print in your slicer.
I made a version with sound reflectors, assuming your speakers are mounted on the bottom of your phone.
I printed a bunch on their sides (with support for the versions with side supports) which turned out good. But when I printed one up vertically (with the support underneath) that did not come out as well.
This should work with any combination of cellphone, case and cable, but print at your own risk!