Spool Stand V2 for Printrbot Plus Metal

This is a mod from my **Spool Stand v2** :
http://www.thingiverse.com/thing:281848
But baked for the Printrbot Metal Plus (1412).

You'll need **4 standard 608 bearings**, nothing else (except maybe sand paper)

The bars are design for specific and general spools :

- the colorfabb 750g spool is for...gess what !
- the 7cm wide taulman is for Taulman nylon spools
- the 7.5cm wide spool for Printrbot Wood spools
- the 9cm is for general standard Reprap spools of 1.75mm filament