This is an ergonomic (for me at least) whiteboard cleaner.

And, as a bonus it prints easily without supports.

I made the little blue strip by soing 2 color changes.

Uses:

3D printed part

Two 8x10mm cylindrical magnets

A piece of felt (thicker than 1mm) (It is best to use black as it does not show dirt)

Something to cut the felt (Scissors, laser cutter)

Some kind of glue

Assembly:

Glue the magnets into their holes.

Cut the felt to size.

Glue the felt to the printed part.

Enjoy!