Some time ago I broke the plastic shade of our floor lamp in the living room. So I modeled a replacement and I think it works great. I tested the model with an LED bulb, so I don't know if the plastic will heat up when using a classic bulb, but they probably aren't made anymore.

If you are looking for a second lampshade, you can find it here: https://makerworld.com/en/models/1772191-small-lampshade#profileId-1886872