This is a mount for a GoProHD camera. A minute with a razor and both parts accepted the GoPro male part very nicely. No slop at all. Just stick a piece of double-side tape on it and attach it to something.
This mount is interchangeable with the OEM mounts and my other mounts.
Printed on a Trinity Labs Aluminatus. I tried printing both horizontally and vertically, and both worked fine. If printing vertically I recommend adding a fan or printing multiples to give the layers adequate time to cool. Just a minute with a razor is all that's required to make them very nice.
Edit: Adding new curved version and with supports for vertical build.