BuMat Brand Spool Spacer for Printrbot Simple Metal Spool Holder UPDATED

This is a spacer to center BuMat 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=bl_sr_electronics?ie=UTF8&field-brandtextbin=BuMat&node=172282
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It should also fit any spools with an inside diameter of around 57mm.
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UPDATED 2014-08-04. I increased the diameter slighter and raised the edges for a more snug fit. Lightly sand if too snug.
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I also made space