This simple phone holder in addition to phones or tablets also fits any equipment, even heavy, because the hinges are strong enough to hold, for example, a 12V7Ah battery.
Allows 360 degree rotation with 18 degree steps.

Anycubic

All-metal Mega

No

No

200

70

I designed my own supports to print the pieces together without the need for supports, except the hinge shafts which are printed separately, but the pieces are published separately for those who want to print them separately.

Assembly is simple but the hinge shafts need a lot of force to be inserted.
It may be necessary to use some tools to adjust the hinges, depending on how accurate the print result is.
However the hinge pins must be tight enough to support heavier equipment without opening.

freecad