The brushes still need to be assembled: take the rectangular pieces from the printing bed and twist them together to form small brushes. Then carefully glue them into the openings provided. If necessary, trim the outer ends slightly and stabilize the whole thing carefully with a few pieces of heat-shrink tubing. Be careful with the heat you use, as this can damage the brushes!

When installing the brushes, make sure that you do not tighten the screw too much. The brush head needs enough space to move. If necessary, use a small, suitable washer for installation.