I could not find what I was looking for, so I decided to make it. This is my current version of the stackable spool holder. I think I need to make the ends of the sticks a hair thicker, but getting there. It's currently functional, but it is a hair flimsy. Like I said, it's getting there. I'm currently using PETG for the print (trying to learn how it works printing wise), but I'll try PLA soon. I also need to design a spindle for this, so it can be printed from top to bottom.

Before printing, make sure to rotate it so the bottom is flat. I will fix that in later versions.

Including the .f3d files

Picture includes earlier versions (on the left). The bottom right (with the blue TPU) is the latest iteration, supporting a semi failed print that I sort of made work over it. Since the (sort of) failed prints mess up towards the end, the bases still work as stack testing.

Journal entry, unix timestamp 1579458972:

I am starting a print using white PLA (Overture3d, was using the clear PETG of the same brand). For spindles, I'm currently using small wooden dowels, some holes drilled, and random things through them to keep them in place. Honestly, I feel I'll keep that kind of system. Currently using snippets of filament and superglue, have also used twist ties wrapped around and glued into the holes. I'll update with how this goes.

Journal entry: 1581619144 Using white and grey PLA, I have my final stacking working. I had to file a little on the stacking stick because of tolerances on my printer, but it works very well. Use the v2v5 files. Enjoy, world.