Just a simple bird box i created, I've used a 28mm hole. If different sizes are required let me know and i can publish them as options. The top is a nice snug fit.

The roof and main body are best printed upside down. so no supports should be needed. You might need a brim for the main body depending on your printer.

Depending on the tolerances of your printer your may need to scale down the stand so that it fits through the hole or sand it if preferred. Mine fit the hole great so super glued it in.

Two mounting holes are provided so that it can be hooked over two screws to secure it to a wall. I would recommend that the roof is just pressed in place rather than glued so that the bird box can be removed from the wall and cleaned if required.