ColorFabb reel holder

My CEL Robox 3D printer comes with smart reels that transfer filament information when you load a reel. But sometimes I want a colour that isn't on a smart reel, but is available from ColorFabb – especially with their new color-on-demand service. So I created this custom reel holder for ColorFabb to be used in conjunction with my Robox one (thing:2959385). Since there is nothing on the ColorFabb reel centre to locate on, I have made a centre-piece which is a force fit. The spokes should be c