Modular Bird Nesting box

UPDATE Added 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 the subject (by no means exhaustive) showed various designs and available open-source – everything from very classic designs to more quirky and innovative models. The functional elements I was looking for was: a simple classic design easy to print with as few pieces as possible. easy assembly without using glue or other adhesives. waterproof by design (many models include joints that leave cracks for easy water access) drain holes in the bottom (water will occasionally get trapped inside) simple, robust and easy to