I started with the fact that I needed to reduce the original to 150mm. And then I gradually modified it until it's a fairly over-modelled version.
So: a small 150mm diameter spool that can hold up to 300g of filament samples. This is one model needed to print 2x, the spool halves are identical. It is possible to connect it further into a half width daisy chain if someone would use this option.
There is a clip integrated around the perimeter for the end of the filament.
The author remixed this model.
Significantly redesigned in all parts. Strengthened connections, reduced diameter, added integrated clip.