Print both parts. I used PETG.
You must not use support for “gopro tripod part 1”
For the second part you can use support but only on the underside (I used “support on buildplate only” and increased “XY separation between an object and its support” to 4 mm).
After printing you can move the tripod stands (you might need alittle bit of force).
Glue the two parts together.
Put the nut in the groove and now you can mount your gopro on it.
Disclaimer: gopro is in stl-files not included :-)
The author hasn't provided the model origin yet.