Ultimaker2 Reel Holder for 40mm hub spools

Ultimaker2 comes with a 50mm diameter reel holder. The reels have hubs around 53mm or so that are "Ultimaker Compatible". Don't get me wrong, you can get awesome filament from Ultimaker, and from others like Colorfabb (love this product), but I like to keep my options open and have access to more of the market.
This reel holder uses the factory mounting holes for the Ultimaker 2 and has a 35mm diameter for nominal 40mm hub spools like those made for Reprap, MakerBot Replicator 2, Afinia, Sol