I designed this lamp shade to fit a standard E27 bulb. The shade mounts using the regular E27 locking nut found with commonly used E27 map fixtures. The hole for mounting is 41mm big, but can be resized using the .3mf file. I've created two .stl versions (200mm & 300mm).
 

I found transparent filament to work amazingly well!

Print settings:
I used vase mode with 0.2mm layer height and 3 bottom layers. Seems plenty strong to me for a lamp shade.

Hope you guys enjoy!