A hole cover for your garden bird house. Keeps woodpeckers and predators away from the nest and keeps the bird house as good as new for many seasons. A disc with 36 mm inner radius and 52 mm outer radius with height 3 mm. The one in picture has 80 % infill, printed on the MakerBot Replicator 2. Modeled with CINEMA 4D R14 Studio. Use PLA plastic! http://www.creativetools.se