I have printed this one:-
http://www.thingiverse.com/thing:177794
Fits onto the spool holder of the UM2. Coils can be a bit of a pain but the big benefit is that the filament isn't in tight circles which can increase the friction in the Bowden tube.
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the_schire 3
Print yourself one of these http://www.thingiverse.com/thing:140857
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