You probably shouldn't build this. The threaded rods and casters are a little expensive. It takes a long time to print. It's more fiddly to put together than I had hoped. But - If you have larger spools of hookup wire like this, this, or this, it may be worth it to you. When put together it is very strong and stackable.
There are a few changes from the original: change in size for larger spools, addition of small M3 ruthex thread inserts to make it stackable, minor changes to make accessing the spools a little easier, and a rolling stand with small casters and ruthex M4 inserts. I also included a cleat so that you can attach it to a wall. The cleat is 6 spools wide. The cleat is designed to be used with the stand - so that it hangs vertically when placed on a wall. Without a stand it will be spaced a little far from the wall but should still work.
I think M3x10 cap screws will work for everything. M3x8 or 12 will also work for most things, although M3x8 will be too short for some things. The casters attach with M4x10 - but you need to use button head screws so that they don't interfere with the casters. For instructions please refer to the original. It's pretty self explanatory, but fiddly like I said.
The author remixed this model.
I remixed this model for larger spools like these.