Of all the many extruder choices what is the one you prefer to use?
Direct drive or Bowden ?
3 or 1.75mm ?
1.75 bowden
I do not have enough hands on experience yet as to what is good and bad about extrudes, but i do like this one.
This one by @Richard_Horne is popular:
http://www.thingiverse.com/thing:60531
I have adapted the design for 3mm filament and it works well for me.
The eckstruder looks very close to the one i have linked in this post.
I use the @Richard_Horne extruder as well. So far it’s been good to me.