Ring-flash case for 300 LED.  Designed for Nikon 72mm hood holder.  (works fine with the AF-S NIKKOR 50mm f/1.4G)This device is designed for Nikon lenses 72mm hood holder.  Print: For filament prints, make sure you do not print skirt as it may obstruct the led pins holes and affect radius of led lense holes.  Printing the LED grid part with white material may increase luminisity.  LEDs:  You need 300 LEDS for this flash verssion. White LEDs can be purchased online, make sure you choose white light LEDs 5mm lense diameter. See led detail in pictures gallery.  I chose to connect the LEDs in parallel to prevent from the all device shunting-down if one led fail. But serial connect shall work as well.