Kettler Dreirad Griff - Kids trike grip handle from flexible fillament

My kids old trike lost its handles and needed replacement. But the shaft diameter is far from regular and I did not find an easy replacement for it.
So I decided to print a nice handle myself from NinjaFlex flexible filament.
It works a treat!

It is designed for 16.4mm shafts. But you may resize them in your printer's environment.

I've been printing it with a thick wall (three layers of 0.35mm -> 1.05mm) and only 10% infill.
The result was a very soft and spongy handle.