Designed for my HTC Inspire with a case. Fits phones between 3.5 and 5 inches tall and 2.8-3.2 inches wide, with a depth of approximately 0.5"
It is designed to mount to a Go Pro mount, either suction cup or adhesive mount.
This is designed to hold my smartphone for GPS duty in my truck, so it is made a bit stout.
I will eventually add some thumb nuts to allow tool-less operation,
Upper piece has a thin wall support built in, but your machine should be capable of doing decent bridges (mine is questionable)
The mount piece could be used for other GoPro mountable items, maybe even into a standard tripod mount for regular cameras.
Print each piece, clean up, assemble as per the photos with 4mm bolts, at least 35mm long and nuts. I used some 2mm thick craft foam (wal-mart, any arts and craft place) to provide some padding and glued with a small amount of superglue.