The GoPro frames described below are designed to accomodate the Hero 3+ camera so that it can be fixed onto a standard mount such as those used to fix a GoPro camera case to a tripod. (I have also tried them with a GoPro Hero 4 and found no problems with fit).
I have made two sizes - one to fit a standard GoPro camera and a second for a GoPro camera fitted with a Battery Bacpac. There are also two styles - with "ears" and without. The "ears" style has two side pieces designed to protect the lens should the camera get knocked over accidently.
Each frame consists of two pieces, the close fitting main frame body and a separate securing piece which goes over the front of the camera to stop it falling out. Fitting the frame together is quite simple and as a picture is worth a thousand words, take a look at the photographs below for "instructions"!
The photographs above show the bacpac size frame without "ears". Below, you can see the standard size frame with "ears".