Summary

This is a ducted version of Cameron, the super-simple-to-print 3" quadcopter frame (see here for details: https://www.thingiverse.com/thing:6243534)
Intended for indoor and obstacled environments.
I printed it in PETG-CF, this takes some abuse and will not be stopped by a few twigs and leaves.
Note that the ducted version is significantly heavier (+20g) and much, much slower than the open prop version.
In contrast to the open-prop version, the ducted version requires print bed supports.