Just moved into a place with an open light bulb. designed this replacement light cover to diffuse the light better and look nice. Currently fits a 3 ¼ inch base and a 100W equivalent LED light bulb. Is scalable to whatever size base you have, just make sure to scale accordingly (i.e. x and y only)

I made this from white PLA, with 2 walls, 25% infill and 4 top/bottom surfaces (for optimal transparency at the bottom of the light and some more strength at the attachment site). 

Printed on my K1 with no supports, variable layer height, in about 6 hours.