This lampshade design was made in Cinema 4D using polygon modelling techniques.
The shade’s concentric walls have interlacing square holes which hide direct line-of-sight to the lightbulb.
The single STL-file measures 140 x 140 x 140 mm, including the built in hole for attaching the shade to a standard light fixture.
If you 3D-print this design, please do not use an incandescent lightbulb. Use a LED light source instead.