Prusa i3 spool holder

My version of fully 3d-printable filament spool holder.
----
Idea come from [CreativeTools](http://www.thingiverse.com/CreativeTools)

I just remade it to be a bit more efficient (less plastic and time spent printing) and that it can be fitted on Prusa i3 frame easily.

22.3.2016 UPDATE!!!

-added v1.5
-added wheels and spindle for 1.75mm filament axes
-added free filament holder

I decided to upload v1.5 instead of new v2, because it did not meet my expectations and perform worse than v1. I have just a little spare time so it may take a while till I finish it.

v1.5 is just tweaked update of current parts
-wheels and spindle have bigger holes so they shouldn't need sanding.
-spindle has a bit taller base so wheels doesn't look out ot top and doesn't interfere with filament spool and also a bit wider cone so bigger diameter spools will fit.
-holder has octagonal pins instead of sqare ones so they fit in round holes more easily
-body has reduced height to save