Phone dock for larger phones (S4/S5)

So I wanted to print out things for Christmas for my family to show off the printers capabilities, for fun, and save a little cash in the process. I decided to design a phone holder that my dad could use with his new S4 (in or out of a case) in his truck.

One caveat to this design, however, is that the back section (the stem and suction cup) come from a old dock I had for a droid razr. I could have printed the stem and found an adequate suction cup but I had them laying around useless so I