This is designed to be printed with 0 top/bottom layers, 5-10 walls/perimeters to use infill (triangles, honeycomb or cubic) to save filament and be stylish.

There are 3 sizes: 

150mm: to transfer the last 100-150 gram or so to save space.

100mm: to be a sample spool. designed to take  around 30-50 grams of filament.

85mm: designed to be as small as possible. only really usable for a very small sample or to put cleaning filament on for easy storage.

Just print the female and male counterpart of the spool size you want and thread them together.

On the spool there is 2 through-holes for 3mm or 1.75mm filament for easier spooling.

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https://ko-fi.com/jobis