Dry Reel Holder

This reel holder design keeps your PLA dry.
PLA is very susceptible to moisture, it is essential that it is kept dry to prevent problems. http://www.shini.com/ep_edm/en/contect_246.html
The main problem I had was the extruder blocking, especially with older filament. Newly unpacked filament worked properly for a few hours but started blocking within a day.
Now I have been printing without problem for over a week.
Mk8 upgrade without cutting for REP 2 http://www.thingiverse.com/thing:35810 ,
adding oil to the filament as described at
http://www.thingiverse.com/thing:103729 and
Surface Finish Calibration Test Shape http://www.thingiverse.com/thing:39050
also helped greatly.