This is an Art Deco style lampshade designed to fit a standard US lamp socket. Printed in "clear" ABS it works well with a 4.5 watt ("40 watt" output) LED bulb.
UPDATE: please use version 3 of the top section. I've also uploaded the matching scad file.
All three pieces are designed for spiral printing.
Print the body and top section slowly, particularly watching at the end to avoid (as much as possible) overheating at the tips.
The top section has a cylinder in the center which will need to be trimmed down to allow the bulb to fit. It is left long in the model to serve as support during printing.
Print the connector at whatever speed you desire with the top and bottoms turned off. It is just a tube.
The connector will be a tight fit. Carefully insert it into the top section, pushing it all the way up so it rests against the flutes. Mount the top section onto your lamp holder, insert the bulb, and then carefully work the main body onto the connector. Some twisting may help to close up the gap (since the spiral on the connector acts a bit like a thread).
I printed everything on my Rostock Max v2 with a 0.4mm nozzle at 0.8mm width and 0.2mm layer height. The examples were sliced using Cura. I'm unsure if the other slicers will handle the incomplete base of the top and body sections. Watch out for that if you use another slicer, you want a 76.6mm hole in the bottom of each part.
USE CAUTION the first time you assemble and turn this thing on. Don't just flip in the switch and walk out of the room. Hang around a while until you understand how much heat your particular setup will generate and you feel that the thing isn't going to melt or, worse yet, burst into flames. Don't be an idiot. Also, it should go without saying that it PROBABLY IS NOT A GOOD IDEA to use this with an incandescent bulb...again, don't be an idiot.
If you do run into heat issues, you could probably cut some holes in the top and bottom to provide better ventilation. Baffles could be added inside (just loose, sitting on the steps) to avoid light "beams" from spoiling the look. I haven't tried this, but it seems like it would work. The bulb I'm using seems to reject a bunch of heat though the edison socket itself, which works out really well with this design, since the body of the lamp holder is outside the plastic pieces.