The 16 pixel Adafruit Neopixel rings are almost perfect for welding goggles, but aren't a tight fit. I made these to fit the costume goggles adafruit sells. If printed in white, the top also diffuses the LED's some.I'm also including the OpenSCAD file so you can make them fit your goggles.I've made separate STL's for the top and bottom. If you print the bottom in an opaque plastic, you may be able to get less light spillage inside, though it is still not recommended to wear the goggles on your eyes.