I modified the snap details from my original mod to make this thing bulletproof. Easy to install and holds the gopro well.
Make sure to print in the orientation with gopro mounting bosses parallel to build platform. This will give you the greatest strength of the snap details. The file was saved in metric, so please scale as necessary (might need to scale by factor of .001).
If you would like it printed for you please visit shapeways, and you can purchase for around $30.