Grohe universal tap handle (20201000)

My kids can't open/close the tap without it. 

Since it's one of the first 3d models I made (about a year ago), you might need to adjust X/Y compensation in your slicer to make it fit snugly. My printer wasn't fully dialed in back then.

I noticed today that someone else had the same excellent idea and posted it :) Great minds think alike ;D 

You can find the other handle here so you can pick the one you like: https://www.printables.com/model/361229-lever-adapter-for-small-taps

Part is printed using PLA+, but regular PLA or any other rigid plastic will work.