Kohler Faucet Spray Head Aerator Puller Tool

Kohler suggests using a wrench, but as this person experienced, the aerator still wouldn't budge. I made this tool to fit, and it successfully opened my faucet.

I printed it with four perimeters, 50% infill, a modifier box for 100% infill for the ~3mm where the flat disc meets the box, and organic supports.