The file 'Cap With Embedded Nut For Moon Lamp 3D Printer Model' is (stl) file type, size is 3.8MB.
the new file has an integrated screw to fit the lamp top as shown
includes cap files for the regular sized moon and a smaller moon printed at 85% scale from this link: https://www.prusaprinters.org/prints/75909-remix-of-moon-lamp-for-the-prusa-mini-printer
I think it's supposed to be this socket type: "B&P Lamp Threaded Shell with Ring Phenolic Socket"
see following links for examples of images
https://www.amazon.com/s?k=b%26p+lamp+socket
https://www.amazon.com/s?k=b%26p+lamp+socket+nut
https://www.amazon.com/Lamp-Turn-Knob-Phenolic-Socket-Threaded/dp/B01M1LNGFO
"There is also a self designed M39x2.5 union nut. You propably will have to scale the nut up in X and Y by a few percent to make it fit." - from maciejb's link
mini_moon_cap_2.stl | 1.4MB | |
mini_moon_cap_w_screw.stl | 1.5MB | |
Moon_Lamp_Adapter_M36.1x2.5_v2.stl | 7.5MB | |
Nut_M39x2.5_92.5.stl | 9.7MB |