Shower Knob with 3:1 Gear Ratio

A 3:10 gear ratio knob for fine adjustment of water temperature in the shower with little effort.

Required one of each part except the gears which requires three. I also used M5 bolts and MR105ZZ bearings for the three planet gears.

After post print sanding and paint, the gear ring was glued in place to the shower, the rest of the planetary gear parts were assembled and snugly fit into the gear ring and over the shower valve. The knob was then fit over the planetary gear assembly.

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