There are now a wide variety of cheap floor lamps available, some of which have both an upward-pointing main light and a downward-pointing reading light. Unfortunately, the plastic shades can't take the heat trapped in the downward-pointing reading light, and essentially disintegrate. My improved replacement closely copies the shape of the original shade, but with the important difference that it has vent holes to allow the heat to escape, as you can see in the photos.
I can't guarantee that this shade will work for you, but I'm pretty sure replacing the original shade with an identical one wouldn't work.
Not much to say. Easily and quickly (for such a large part) prints without supports in the orientation given. It took about $1 worth of white PLA to print it in under an hour on a MakerGear M2.
The shade attaches using a black plastic screw-in retaining ring, which was intact, so I did not print a replacement for it.