I was having lots of issues with my mini extruder and mounting it so that the bowden tube had smoother curves just about cured all of them. I can now extrude very consistently without having to use any extra pressure on the filament. This is the single biggest improvement I have made to my Mendel and means I have taken great steps forward in improving not just print quality but also reliability. I have had zero extruder issues since using this mount. I canabalized the spacer from the original Mendel parts and the curved bar mounts were modified from: http://www.thingiverse.com/thing:34131