I wanted an adjustable mount for my solar panels.
It needed to be light weight, portable, easy to use for taking on camping trips
The solar panels are heavy so most designs where the angle of the leg is rotatable/adjustable has too much bending moment on it. A vertical leg is has the least load on it.

To Use:
Slide to dowel up/down in the hole, to the desired panel angle.
A thin bungee cord/elastic tied around the shaft stops the panel from sliding down.
Two holes (with different angles) are provided in the mount (marked winter/summer). Select the hole which has the pole most vertical for your desired angle.

Recommend to use PETG filament as solar panels can get hot