Mini printable filament reel / spool

This mini filament reel is for small amounts of filament and prints easily on a 150x150 bed. Part (a) holds the filament and part (b) is the end cap. I've also made a version of part (b) with a filled-in segment for labels etc - up to you which you use. You can print part (a) complete to get a 3cm width reel or stop it at any point. My photo is of a reel that I stopped after 2cm, it's holding about 10-15m of filament.

Features: 80mm diameter cylinder to wind the filament which prevents bruising; 37mm centre hole to give an easy fit without wobbling; filament hole at the centre to get the winding started; filament hole at the rim to lock it when fully wound (the spokes are also good for locking the end of the filament.

The freecad source is also included in case you want to tweak sizes etc. Note that I passed the freecad exported stl through the fixer at netfabb otherwise Slic3r (v1.2.9) missed out the central spokes for some reason.