Single Extruder conversion for CTC

I wanted to change my CTC to a single extruder printer. With the lightweight head I hope to get even better prints or to print at higher speed.
A great design is thing http://www.thingiverse.com/thing:1336355
But I missed the cable guide. "You move the problem of braking cables just a few mm to the top", friends said, but I just feel better with the guide. So I found the remix http://www.thingiverse.com/thing:1345768
With this thing the right side of the top, where the filament is led throug