Update: Due to request I've attached the Fusion 360 file for this item. It's derived from the previous design and so it not as attractive as I'd like it, but does print well. Please see my alternative charger designs for somewhat different approach: https://www.thingiverse.com/thing:3455211
Update: I noticed that the power cord openings were not following the 45 degree rule so modified those to avoid supports.
I liked the original version of this holder because it was all 45 degree angles and could print well without supports. Since my daughter uses her phone for recipes in the kitchen a horizontal charging position was more convenient and I modified the original design to accommodate that. Works nicely with the S6 and S7 and I'm sure many other phones will fit as well.
The charger is a cheap Qi from Banggood but works quite well. If you're picky, you'll want to do a support at the plug opening on the top of each side as well as the top of the arc, but it seems to print in ABS without too much trouble without.
Nothing fancy. Sliced with Simplify3D