Reliable extruder I can print?

[Geoff]

I ended up building a new one. The Aurora prusa/Z605 has the same problem, the bearing has no rails, the filament tends to slip off either side of it. The hobbed gear I had was a 1.75mm/3mm compatible, so the 1.75mm filament never sat right in it to start with , so I made of of infill 3D's geared extruders, and WOW...
The only thing I needed to buy really was the hobbed bolt, with an offset of 25mm, but holy crap, best extruder I've ever made/used.

http://www.thingiverse.com/thing:443849

[TehStranger]

I ended up building a new one. The Aurora prusa/Z605 has the same problem, the bearing has no rails, the filament tends to slip off either side of it. The hobbed gear I had was a 1.75mm/3mm compatible, so the 1.75mm filament never sat right in it to start with , so I made of of infill 3D's geared extruders, and WOW...
The only thing I needed to buy really was the hobbed bolt, with an offset of 25mm, but holy crap, best extruder I've ever made/used.

http://www.thingiverse.com/thing:443849

Hmm... cant use it because my printer has the V-slot rails so the carriage is different but I could design one like that for my printer.