This is a customizable sifter that can take on many shapes and sizes. Varieties of screen inserts can be generated that will fit in the cup for shifting different size objects. This could be used as an aquarium rocks cleaner, a kids beach toy, a coin separator, or anything else you can come up with.

Read through the various options to get a sense of what each one does, then adjust to your desired sifter sizes and built plate layout. Make sure to change to Final before exporting an STL.