I was in need to design a pedal for a speed controller with potentiometer. The need was to have a small footprint (kid car toy), and no specific external component to add.

Therefore I design this model, fully functional for me, adapted for standard potentiometer such as 10k ones. The feedback force for the pedal is ensured by a simple clothespin spring.

You just need a clothespin and a potentiometer.

4 STL pieces :

• pedal base
• pedal top
• gear and rack to act on the pot
• 4 axes (3 use +1 if some broke in case of sanding)

I print it on an ender 3 pro, infill 50%. It's very small and thin pieces so you may print it with an infill of 100% to make it stronger. At a first glance, you can print it light just to test your potentiometer size. You may need to enlarge with a cutter the axis of the gear to insert your pot in the gear.