This can be slid over the home button of an iphone. It helps prevent children from accidentally exiting movies and games while playing with the phone.It can then be slid on the back of the phone when not is use. In this position it provides full access to the home button.This was sized to fit an iphone 4 in a thin Incase shell. It does fit an iphone with no case, but slides off easily because of the glass surface. I have not tested it's fit on any other case. You may need to modify before printing for another case.I suggest you print the item using these settings. They will insure the item is filled 100%. http://www.makerbot.com/blog/2011/03/18/super-sweet-printing-tech-zero-extra-shells/The print includes small mouse ears on the corners to prevent pealing and warping when printing raftless. Just cut them off when done. If printing with a raft you can remove these from the source before printing.