The instructions to create the lampshade are in this video:
Lamp
https://www.amazon.com/gp/product/B07QKB7TCX/
Lithophane Utility
http://3dp.rocks/lithophane/
Excel File Download
https://www.thingiverse.com/thing:4547791
Good luck! ^_^
Use a filament that allows light to shine through when thin, but blocks light when thick.
NOTE!!!
Under no circumstance should you use pre-generated .gcode files, it is extremely risky and could damage your printer. Always slice the files yourself.
The author hasn't provided the model origin yet.