A very simple lamp shade that uses a small amount of filament (34g). Print it in vase mode (spiral vase in Bambu slicer). With my Bambu P1S it took 1h30.

The diameter of the hole to mount it is 29 mm, a UK standard, but you can easily modify it to your need using the provided stl or step files, or by duplicating my file in Onshape. There is no problem to put/access the E27 bulb to put in it.

I recommend using a colored PLA to bring in a nice mood in the room, or a white/translucent one if you have colored bulb already.