The touchless soap dispenser from Simplehuman uses two small gears to propel the soap from the reservoir to the dispensing tip. One of the gears on one of my pumps cracked in half. This is an identical replacement. I printed it in PLA, but put put the part into a jar of water for a few weeks to see if it would deform or swell. It did not, so I put it into my broken pump and it fixed the problem and the pump works just fine.

The black gear in the photo is the 3D printed part and the white gear is the original. My part will work in either position.