Summary

I wanted several lamps to put around the house, so I came up with this basic design. It's a glorified enclosure for this $3 Leviton bulb socket:

https://www.homedepot.com/p/207106566

You'll see plastic ones in the store for a bit cheaper - spend the extra $0.50 for the ceramic. The weight gives the lamp some heft. For the cord, you can either scrounge one from your junk box (you have a junk box, right?) or get one of these light duty (no pun intended) $2 extension cords and lop the end off:

https://www.homedepot.com/p/312404401

Wire the narrow side of the polarized plug to the gold terminal and the wide side to the silver. That makes the bottom of the socket the spicy part, and while the walls of the socket at line neutral. For a switch, either use a switched outlet or one of these $3 in-line lamp switches:

https://www.homedepot.com/p/315274188

There are 4mm holes in the base that you can tap for #10 machine screws to hold the socket to the base - wood screws will probably work fine too. This upload includes a couple of channels for zip ties so you can secure the cord in place. (I used hot glue on the prototype print shown above.)

White PETG works well for the shade. Clear is too clear. It's designed for a 0.4mm nozzle and 0.5mm line width. Enable the "fuzzy skin" feature in Cura to make it diffuse better. You can print the base out of whatever you want.

The FCStd file is included in case you want to tweak it. I designed this with composition in mind - if you want something fancier, you can design it, then boolean the parts together.

If you want to learn FreeCAD, I'd recommend MangoJelly Solutions and Joko Engineering on YouTube - they have the best tutorials.