SainSmart Brand Spool Spacer for Printrbot Simple Metal Spool Holder

This is a spacer to center SainSmart brand spools of plastic for my Simple Metal Spool Holder available here: http://www.thingiverse.com/thing:322923
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Fits these roles of plastic: https://www.amazon.com/s/ref=nb_sb_noss?url=srs%3D5299213011%26search-alias%3Dspecialty-aps&field-keywords=1.75+filament
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It should also fit any spools with an inside diameter of around 48.5mm.
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I also made spacers for Printrbot and BuMat brands of plastic. If you want a customized spacer for your favo