Simply a grip for holding your smartphone with ease. print with 100 fill, 2 shell, 0.2 layer thickness, no raft, no support low or high res work the same. Use a large paperclip (wire diameter of .8mm) clipped to 14mm and 30mm as connecting hardware. there are beveled edges, so the clip folds flat, make sure you line them up correctly. if they don't, take it apart and flip them around. i used elmers glue dots to attach it to my case, but 3m adhesive works also (the sheet kind you get with iphone digitizer and screen replacements). For the correct placement, put the grip (with adhesive attached) between your fingers as if it was already on the phone and stick on in a comfortable position. edit it is also wise to give a light sanding to the corners of the piece that touches the back of your fingers. i didn't realize how sharp the printer would make it when i designed it...