Planetary Gear Box for Small Stepper Motor

Update: created new 16 tooth GT2 gear head (6 to 7mm wide)

A 4 to 1 planetary gear box for common small stepper motors. Takes your typical 7.5 degree per step motor and turns it into a 1.8 degree per step. I have a ton of small stepper motors I have ripped out of printers but the resolution sucked... so I made this. Plan on making more gear heads later to fit different belts/pulleys.
READ INSTRUCTIONS!