Improved Universal Spool Adapter for FDM printers

For the past few years, I've been using a set of spool adapters by jantzenday, which I later remixed to fit the Amazon Basic's spools. jantzenday's original model is at: https://www.thingiverse.com/thing:2387254

My Amazon Basic's adapter is at: https://www.thingiverse.com/thing:5242062

I finally got around to modeling my own version of a spool adapter. My adapter differs from jantzenday's adapters primarily by being a bit more comfortable to operate. Instead of each adapter consisting of a threaded screw with an end already on it, and nut, my model comes as a threaded shaft that will require 2 nuts, a nut on either end.

These spool adapters fit a 30mm spool holder, which I believe is the size tube that used to ship with the Creality CR-10. I don't have an actual CR-10, but the tube I use on all my printers is at: https://www.thingiverse.com/thing:4110024

All of my machines using the same tube allows me to swap spools between printers quickly and painlessly.

If you