I found a model of three-speed automatic transmission at https://grabcad.com/library/gearbox-...transmission-1 but it was not made to be 3D-printed. The six-speed automatic transmission at https://www.thingiverse.com/thing:1094616 was made to be 3D-printed but it was made for trucks, not cars. On that transmission, the blue and magenta parts are clutches that slide back and forth. The light green, dark yellow, and pink parts are bands that use levers to stop them from rotating. The three-speed transmission has very thin "wheels". I need to design a three-speed transmission with bands and clutches.

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