Update October 28, 2017: Redesigned as two parts to glue together (easier to print, a bit higher positioned on the frame): http://www.thingiverse.com/thing:2612257

Just another spool guide that fits on the i3 frame. The advantage is the fact that you not only can pull the filament through also after the print has started, there is a small notch to hold the filament if you need it for the next color change or during other material changes.

Enjoy!

Doesn't Matter

Yes

0.3mm

30-50%

Print it as the STL file is positioned (upside-down). Needs support for proper fit to the frame.

123D Design