Lampshade - restructured for my "screw-on" shade lamp.

thingiverse

I modified the original design using Tinkercad to fit a lamp I have that features a screw-down base for the lamp shade. The process involves removing the large retaining ring, placing the shade inside, and then re-tightening it. Obviously, I also removed the bulb from the socket holder. In my case, the diameter of the bulb socket holder without the retaining ring is 35mm (inner) and must be at least 55mm (outer) to clear the retaining ring.