The crank supplied as standard with the BioToi is relatively long and can bump against the wall if the toilet is placed flush with the wall. With this shorter version, you can avoid this problem without having to change anything.

An approx. 6cm long M5 screw is required to mount the handle to the crank. I recommend using PETG as printing material.

Update: Added a slightly reinforced stl file since my first broke due to some “overload” ;-)