Is your plastic filament a mess?  If you just leave it sitting around you probably have had your fair share of knots and tangles.  Don’t despair, Thingiverse has solutions!

Check out this laser printed filament spool:

Filament Spindle v0.4 by builttospec

It should be noted that this is a derivative of Erik’s and CidVilas’ work.  Taking a design and making it better and custom FTW.

There’s also a spindle design that FDM  (fused deposition modeling) type machines like the RepRap and Makerbot can produce. This one is by tbfleming:

Printed Filament Spindle by tbfleming

All those rods and connectors are sort of remind me of tinker toys.

No 3D printer at all?   No Problemo!

Cardboard Spool by charlespax

Pax has an excellent design which only needs a knife and some cardboard!