My latest addition to the MT09 accessories. Based on the USB charger mount I created a GoPro mount which fits nicely on the handlebar. I will create an adapter for my iPhone to use it for navigation but hey, you can also mount your GoPro on it. ;-)
Used M2.5 x 20 mounting screws. Make sure to open the top holes to 2.5mm and the bottom to 2.0mm so the screws fit nicely. I added a small piece of anti slip sticker to the bottom part so it fits nicely snug on the handlebar.
I printed with 100% infill for strength and use full supports setting in Cura. (gives support for the arch but also underneath the overhangs in the GoPro mount)
After removing the supports it only required a little sanding to get a perfect fit from an original GoPro mount.