This incredibly tiny fidget uses less than 1.5m of filament.

https://youtu.be/1CqIXvbk_vw

It's available in the following versions:

Large magnets
6x3mm cylinder magnets
Strongest and most reliable click.

Small magnets
3x3mm cylinder magnets
Soft click with an optional middle setting.

No magnets
No hardware required
Depending on your printer's calibration and the filament you use, this will provide a click of variable stiffness.

No magnets V2
No hardware required, stays clicky longer
Depending on your printer's calibration and the filament you use, this will provide a click of variable stiffness.

8x3mm magnets
8x3mm cylinder magnets

10x3mm magnets
10x3mm cylinder magnets