Suction Cup replacement for inside-aquarium filter "Eheim pickup"

Bothered about the always dropping filter i `ve tried to get rid from the stupid suction cups. Before printing helmets for my fish, i decided to to go this way.
Suction cups get hard with the time or get under layered or rough by algae. Finally you have to buy new ones from time to time. Suction cup producers get rich with this.

The solution for me are now Neodymium magnets. Those where you can tow a car with ;)
So i made adapters for the filter and a carriage unit for the magnets outs