Micro Servo Dual Gear System
thingiverse
I needed to be able to turn two gears backward at the same time for a class assignment. By controlling the servo motor, you can make the two gears move in equal but opposite directions. The bottom gear has a cutout for a micro servo horn, allowing for more precise control. You could glue these parts together, but I simply taped them since they fit snugly. If you don't want the cutout, the bottom gear is identical in size to the side gears. Please excuse my makeshift way of attaching the gears - using screws and bolts may not be conventional.
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