I was inspired by this and assembled it, but it uses too much screw like about 20+ screws. I saw this and I got idea on mashing both together to create a phone stand out of a planetary gear systems. In fact, I always wanted to make a rather unique, print-in-place and adjustable phone stand without too much complexity on assembling it after printing. Please continue reading on what you're going to deal with here =D

Specification

• Offset types can go as much as 90' degree angle
• You can slide charging cable from the channel by the feet
• Clearances were set to 0.125mm or backlash of 0.25mm on gear generator.
• Face between gear's teeth measured around 0.13-0.17mm

Print setting

• Design is optimised for 0.2mm layer height but you may get away with 0.3 or 0.15
• When doing a "test print.stl", enable "detect bridging parameter" (prusa slicer) to simulate the real print
• Use support enforcer for the overhang on the phone holder, make sure there are no supports generated within the planetary gear mechanisms.
• Print at around lower half of your filament's recommended temperature to avoid stringing inside the gears or as long as the temperature don't result stringing.
• Add M104 Sxxx with higher temp few layers before printing the knob so the knob will have better layer adhesion.
• Use brim when needed especially the "mini.stl"

Post Processing

• Use knife to separate the rings from another.
• You may need to use pliers to rotate the knob after finished printing.
• Slowly rotate the knob with the pliers until you hear a snapping sound once.
• If you see the planet gears became angled from rotating the knob by force with pliers, try the opposite direction.
• After the snap, the whole gear mechanism should able to move freely

Disclaimer

I did not rip and discredit tmackay's code in order to generate this, I simply modeled this phone stand from fusion 360 and the help of online tools.

I am not sure why planetary gear need some force by using pliers in order to make it move freely. I verified everything and all seems to be correct as well in theory they shouldn't even lock themselves when turning. It's not easy to understand planetary gear designs