Prusa i3 Printable Spool Holder

This is a simple parametric spool holder that mounts on top of the Prusa i3 frame and holds a single 1kg filament spool. Also includes a parametric spindle adapter, in case you need one, for larger spindle sizes.
Videos
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See it in action at http://www.youtube.com/watch?v=MaxoY62o9zk
Updates
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[2013-04-25] Made the top part more solid. Added demo STLs for individual parts.
[2014-07-05] Added flexible spool mounting clips. No rod or bearings needed!
[2015-11-14] Added an ext