Snap-in camera mounts for Eglu series chicken coops / rabbit enclosures. Use these to mount a mini ballhead and security camera in your chicken run. Or use them to add mount holes for something else, I won't tell.

3/8-16 printed thread on the original, 1/4-20 hole for a ~3/8" long 1/4-20 screw on the other. Choose the one that fits your ballhead.

Print the thread with the flat facing down and support it. No other supports required. My threads printed fine with 0.2mm layers and 0.4mm nozzle. Still a plastic thread though, avoid over-tightening.