Yeah, I am surprised there isn't more people doing some of this stuff with 3D printers. There are just some things that lend themselves to this process, specifically purpose built items. On my mountain bike, I used RAM mounts as well as the Contour mounts. Big, bulky, sometimes wobbly and just plain old heavy. And since it was a conglomeration of pieces attached together, there was a lot of instability. Now I am using the new Sony AZ1's, they are less than half the weight of the Contour and a third the weight of GoPro, much easier to mount and the mount itself does not have to be absolutely rigid.
Here is an image with the original built mount on the bike:
By rotating the arm so it is parallel to the ground I can use a different GoPro to 1/4" Tripod adapter, which will center the camera over the mount