This is a mount for the Adafruit 16 NeoPixel LED Ring. It has a top that snaps onto the NeoPixel to keep it from rotating inside the mount, and a bottom with holes for wires to feed through. Both the top and the bottom have 4 mounting holes for M3 screws. I used 10mm M3 socket cap hex screws to fasten the top and bottom together and attach the mount to the underside of a 1/8" enclosure panel.
I used this GrabCAD model of the 16 NeoPixel Ring to help design the mount.
Printed with an 0.4mm nozzle on High profile. It took about 1 hour to print each half, with the top taking a little longer than the bottom.