Prusa I3 MK2 Frame Holder Collection: 3. Short and long spool holders

This is the third part of a little collection of frame holders for the Prusa I3 MK2 (should fit on the I3 MK1 as well). The collection will at least have the following useful holders:

1. Filament guide (http://www.thingiverse.com/thing:2053500)
2. LED light holder http://www.thingiverse.com/thing:2055511
3. Spool holder (short and long) (this part)
4. Camera mount (http://www.thingiverse.com/thing:2067731)
5. Filament sensor holder for use with OctoPi

Each of these parts has been desig