Hello! I have the Dual hybrid motor that bangs at the back after extruding... This can be seen on the video: https://www.dropbox.com/s/1e2futu4eqlt1sf/2016-08-13 13.16.12.mov?dl=0 Could you please tell me what to do to make it avoid it ? Also my extruder fans don't start automaticaly when heat passes over 40°C.... and the plastic doesn't stick when printed... Thanks for your help !