When you wash bigger objects on the buildplate it happens that they get loose from the buildplate. To stop them from falling on the magnetic propeller we constructed a guard for it.
Use a isopropanol resistant material for it. For example PETG better brother PCTG.
Remove the screw on the propeller, store the shim (its not needed) and screw the spacer in place.
You even can use the guard when you use the metal tray.
Thanks to Andi from https://Andi3d.tech for assisting in modelling that part.
The author marked this model as their own original creation.