Reusable Spool with hex grid

This remix of https://www.thingiverse.com/thing:2791930 adds rings and hex grid sides, to improve stability and avoid the filament hopping outside, which I found was a problem with the original. It also adds parking for the filament end. I tried to keep the filament usage still pretty low.

This is a further evolution of https://www.thingiverse.com/thing:4932151. I have added an optional plate for the sticker and added the option of having tubes instead of just holes to park the filament in. I also cleaned up the code.

It requires a repaired version of the flat part of the Little Masterspool, as OpenSCAD finds errors in the original. For convenience, I'm including the other part as well as the hexgrid.scad library I use for it, which unfortunately I don't know where I got.

Print one flat and one with pegs, you can mix and match if you want. Prints without supports. Like the original, clip the two parts together and then put a piece of filament or something through the holes wh