gistfile1.txt

Firmware configuration
    E-Steps/mm (These values will get you close; Calibrate further, or live with crap prints!):
        makerbot Mk7 with 16x microstepping - 825.698
        blddk hob with 16x microstepping - 761.328

    I found that marlin's default settings for E feedrate, acceleration and jerk were all too high for these motors.

    #define DEFAULT_MAX_FEEDRATE           {400, 400, 220/60, 45}
    #define DEFAULT_MAX_ACCELERATION   {9000,9000,100,500}
    #define DEFAULT_EJERK                           1.0

Software configuration
    Reduce your retract speed to 10mm/sec.