Modular Bird Nesting box

Boost MeLike the design?UPDATEAdded an additional top piece with an entry hole of 35 mm - enjoy!----Custom designed birdhouse in a classic functional design customizable to house different types of garden birds. One of the first things I started looking for when getting a 3D printer, was a nesting box for birds. I was looking for something classic, that would accommodate the smaller garden variety of birds (e.g. great tit, blue tit, crested tit, coal tit, marsh tit, willow tit etc.). Researching