Galaxy S3 Bumper Case
Built using the stl file located here
http://www.thingiverse.com/thing:99363
Printed by vector010, and he said "Came out pretty well. Fits the phone decently. Printed it in flexible PLA."
I have not personally printed it yet but I would assume it will fit fine as long as you print in a reasonably high resolution (.2mm or lower layer height) and with either a lot of shells or a medium density infill.