Stackable threaded container, this was a experiment for me learning to draw the treads, and it came out totally usable. It should scale, as long as you scale every part equally. Should stack as many of as you want, just buy adding more middle pieces.

I printed the middle with 15% support from the build plate only (keep it out of the threads) and I have the horizontal offset of the support at 0.35mm

The alternate tall thread files are for 1/2" tall positive threads, instead of 3/8"

If you need something printed drop me a line and we'll work something out.