Iphone 4 chest mount

I made this to wear an iPhone 4 on the chest thanks to the plateform with elastic bands as a chest go pro mount. To attach the case itself and the plateform, use a 4 mm-diameter screw.
It is a work in progress because i did not test it, especially the alignment of the iPhone in the case but it should work fine.
If you want to test it, begin by printing the case to check.