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 figured what the heck I'll design around those parts and I won't have to source the suction cup, after all I know this one works. The dock is adjustable and should fit a range of phones. I designed the back piece to be able to accept #8 nuts so that #8 thumb screws or wing screws can be used to lock the sliding adjustable pieces in place once it has been determined what size is needed for your phone. Also the odd looking circular piece is the part designed specifically for the ball stem that came from my old dock. A plastic nut screws onto that part and tightens around the ball stem. This part will likely be useless to you. I may design a separate piece, a ball stem similar to the one i already have, or something else to secure the dock entirely if requested.black pla on a rep 2 only one part needed supports. 100% infill. added #8 nuts and wing screws as well as a bit of rubber padding where the cell phone will sit. I glued the nuts in place, the odd "nut adapter" in place and the back portion that has the tracks for the adjustment arms in place note back portion came from an old droid razr docking station. (this one http://tinyurl.com/motorola-dock) If requested I can design something to make this work without having to have those parts, but I didn't need it so I haven't worked on it yet.