extruder velleman K8200 Use aluminum frame and E3D improvement: used, the stability of the aluminum frame. you can move the horizontal frame in the middle of the vertical frame. simply changing fillement. easily switch from 3 mm to 1.75 fillement by changing the base block (1,75 mm block in development) used the aluminum frame as an additional cooling. http://youtu.be/CXCkt8PJKaM http://www.thingiverse.com/thing:281085
It will not happen in a while because i also have problems with jams. So i am following the thread about this problems to see what happens.
That's why I made my own extruder. The extruder of k8200 is a waden spring extruder. My opinion is that the spring has only one function for a Bowden feed hotend. In a direct feed hotend you should not use a spring. I print 8 hours a day ABS and sometimes without heated bed but with magic tape. Cura settings: temp 245 Heated bed first 5 mm 50 degrees below 0 degrees with magic tape. Or 0 degrees with magic tape.