Sea Urchin Birdhouse - pre-assembled & expandable

A pre-assembled, expandable sea-urchin birdhouse - perfect for your growing flock. Prints without support.

This bird house looks like a spikey sea urchin and the entrance can be adjusted for tiny birds, e.g. wrens or gold crests, up to huge ones, e.g. golden eagles (maybe a bit hopeful). Each of the twelve "leaves" is hinged on to a circular base and should print pre-assembled and ready to go.

There's a hole in the middle to screw it to a tree...

The idea for this came from a stainles