Gopro bike frame mount
Bike frame mount for gopro. Hole for frame is elliptical, 35.5mm x 41.5mm. Bolt holes are to suit M3. Use standard Gopro bolt and nut to attach camera.
Seat post mount for a GoPro Hero 2. It should fit seat posts that are ~30mm in diameter as it is. You can modify the openscad file to fit whatever bar diameter you need.