I recently purchased a lot of color PLA filaments for a 3d pen and they come in little bags which are unusable for a 3d printer (https://www.amazon.com/gp/product/B07FYSDD5W), so I created this spool
It is called "mini" but since it's parametric you can print one the size you want.
By default it is has 3 mm thickness, and at that size it does not need glue!
as always, all my designs are opensource and here is the link to download:
Fusion 360 file: