This is a nesting box for a Robin. Robins prefer an open box and this is a size recommended by the RSPB. place the box in a shaded or semi shaded area 3 to 5 foot from the floor. Can be printed in PLA PLA+ PETG. The box is screwed into position using one screw through the hole in the roof. The box can be taken down for cleaning by turning the 2 fixtures on the side half a turn.