Would you mind sharing/posting an STL/3MF for these?

Also, is that Galaxy Black filament?

My first thought was Daemon by Daniel Suarez.

I have both a brother laser and a brother multifunction inkjet. Both have been solid for many years. However, with the inkjet, due to infrequent use, i found that the cartridges a/o print head would get clogged/dried after a while. I solved this by setting up a scheduled print job on one of my machines that fires off once a week. That document has 4 1” solid squares, their colors corresponding to the cartridge colors. Since starting this, i’ve had zero clogging issues, and i just recycle the weekly prints as scratch paper for notes, etc.