UK Blue Tit Nesting Box, compact

This is a small and compact nesting box suitable for UK Blue Tits, other birds may find it useful too. The hole is 32mm diameter with a 100mm(ish) drop below the bottom of the of the hole.
This bird box is 100m internal diameter as it has been known for UK Blue Tits to make their nests in 75mm sign posts with their caps removed. This should provide ample space for a nest without the excessive space a traditional 6 inch box provides that needs packing out.

It can be mounted via a single 3.5mm wood screw.
The lid has a .5mm tolerance gap over the base that provided a firm but usable seal on my (cheap) printer, better printers may find this a little sloppy.

I used ABS for may print more because it was loaded and a full spool rather than anything else