I recently bought this Prusa i3: QcAAOSwJkJWih0g" target="_blank" rel="nofollow">2015 Upgraded Full Quality High Precision Reprap Prusa i3 DIY 3d Printer It comes with a MK8 extruder like this: and a GT2560 control board. I am using Repetier in manual mode to slowly feed in PLA 1.75mm filament. The filament gets so far and then the motor skips. I managed to force the filament through onceby riot1 - Printing