Stackable planetary gearset, 1:4 reduction ratio

Planetary gearset with a reduction ratio of 1:4.The design is made so various stagees can be stack together to get reduction ratios of value power of four. You can print one of every two stages symetrically to compensate axial force from helical gears.The size of the gears is m = 2mm. Hardware needed for this project:Radial bearing 4x9x4mm (8 units)Radial bearing 24x37x7mm (2 units)Radial bearing 8x16x5mm (1 unit)