I first saw @GillyBarr's tool holder model. That got me looking at all the Mini tool holders. Of course, none were exactly right for me. Here's mine.
The clip-in attachment was inspired by this model by @adamos_76250.
Designed to be printed with 0.4mm nozzle, 0.2mm layer height. I printed it in PLA.
I set the slicer to three perimeters. Most of the walls are thin enough that only two perimeters are used, but upping to three make the clips sturdier.
The design includes a place to use an M4x8 machine screw to expand one of the clips to “clamp in” the holder. As it turns out, the clips hold well enough that I found the screw to be unnecessary.
The 大力 ("Dairiki" — my surname — in Japanese) visible in the photo is not included in the STEP or STL files.
The author marked this model as their own original creation.