Really simple hand cranked filament winder?

I’m trying to find plans for a really simple hand cranked filament winder. Something that requires a minimal amount of non 3D printed parts, and which can be 3D printed in a really short amount of time in PLA on a cheap bed slinger style printer.

Something that I can get children to print out and assemble as an introduction to practical 3D printing, with the bonus of allowing them to put filament refills onto proper spools, thus saving on costs for their next project by allowing us to buy and wind cheaper filament.

Has to be hand cranked as this is a safety requirement.

Any ideas?