Lezyne Hecto 65 GoPro Mount

This mount allows you to attach your Lezyne Hecto 65 bicycle lamp under your bike computer mount via the GoPro attachment. It ensures that the lamp is kept the right way up and that the light is directed correctly onto the road. This prevents you from distracting other drivers.

However, if this isn't important to you, take a look at Mr White's mount. Using less material works well, too.
My test print is made of PLA and has held up well so far. However, I suggest using a stronger filament.