Designed a robust Master Spool that is easy to print
3d printed threads and snap connectors are nice, but M3 bolts and nuts are more robust and look dope. They also make the model easier todesign print, since you don't have to worry about tolerances as much.
They = quite a few brands so far. The ones I know of include microcenter (inland), fiberlogy, sunlu, and esun. I'm not sure how many are interchangeable but they sell the refills wound onto a cardboard tube/core with a few straps keeping the winds from falling to the side since there are no spool sides to keep it in place. You slot the cardboard core onto your reusable spool sides and once attached you can cut the straps to release the filament.
I think it's more of a replacement for plastic spools, since cardboard doesn't work well in edge roller spool holders and master spools are almost always reusable plastic which does work in edge roller spool holders. If your spool holders work with cardboard rims then yeah there isn't much of a reason.
Lol, i actually don't know. I only know it exists. I haven't actually printed anything in awhile but i like to see what other people are making and doing.