A bubbly lampshade that fits standard E27 light cord (40 mm opening), for example IKEA HEMMA.

DIMENSIONS: diameter 209 mm, height 192 mm

I recommend printing in VASE MODE. Place the model with the hole on the bed and turn on Vase mode (spiralise outer contour in some slicers). Standard shell model of 1.2 mm wall thickness is also included.