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 outside.
The project is not developed to the finish and may not fit to your filter, but sure an inspiration for your own needs.

Previous Thoughts:
I ve chosen the natural PLA because i don´t know if ABS emits hazard parts for the fish. On the other hand i don`t know if PLA gets diluted by the fish tank water on long term.

The magnets will rust under water, so i embedded them in silicone. Maybe to print them in closed, or mold them in a resin may be better.

At least all materials used inside had to be fish-freindly and not to be hazardous for their environment.

Finally the magnet carrier outside is needed to prevent the single magnets smashing together when removing the filter. This could be very painful and hurt your fingers hard. Neodymium magnets are no toys for children!!