i've had a few unused lids for IKEA KUGGIS boxes (18x26x8cm) and turned them into a minimalist birdhouse. you need 3 or more pairs of parts i made and you can make your own.
you will need also need
enjoy and remember to take care of your local birds ;)
birdhouse_pt1.stl | 305.6KB | |
birdhouse_pt2.stl | 602.4KB |