PSI bezel to prevent the wide spread of the LED lamps in the AstroPixels lighting kit available from the URL below. This is part of the dome lighting for R2D2 or other astromechs.
I printed in regular PLA, and you may need to size it up or down slightly to fit snugly into the diffuser part of the PSI light, but if you go more than a percent or two it might not fit over the LEDs. Just be careful when fitting the LED circuit board and screwing the rear of the assembly in to make sure it doesn't get twisted or binds on the bezel.
Update:
Added two new models that should fit when printed as-is in both the front and rear PSI mounts. You should also be able to scale it on the Z-axis to increase the amount of LED light separation.
https://we-make-things.co.uk/product/astropixels/
The author marked this model as their own original creation.