Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4048355.

Having already purchased a "moon lamp circuit", I remixed the screw cap from the original "Progressive Detail Moon Lamp with Rechargeable Moon station by moononournation to accommodate its 10mm diameter barrel around the power input. I also cleared out the majority of the cap details to allow for customization, such as adding my kid's name to it. Without the texture on the bottom, it still came out great due to my textured PEI build surface.

The STL here is without any particular name, feel free to customize it to your needs, or use it as-is.

To mount the electrical barrel, I covered the end of the power port with blue painters tape, trimming it to size, and used a considerable amount of super glue and then used a little instant set to hold it while fully drying. It hasn't failed yet and, should it, I might consider some 5 minute 2-part epoxy or maybe just some hot glue from a hot glue gun.