Spool holder for Prusa i3 with 6mm frame

Note: See the new remixed version: http://www.thingiverse.com/thing:197427
Based on good design: http://www.thingiverse.com/thing:68329
With some personal improvements (stronger, more gaps, aspect ...)
The frame supports are designed to be secured with 3 screws M3x16 each, but you can also use zip ties or even leaving free.
Print:
- 2 x Bearing_Support
- 2 x Frame_Support
Use for mount:
- 6 x M3x16(or larger) screws with nuts (optional use zip ties instead or nothing)
- 8 x M8 nuts
- 2 x M8 nylock nuts (used as caps of horizontal threaded rods)
- 2 x 608zz Bearings
- 3 x Threaded rods about 15-20cm each