I had the same problem if using the manual controls in repetier, solved mine by g-code, G92E0 reset extruder and then G1E100F30 to extrude 100mm at speed 30mm/min, slow but it is accurate atleast for me.
I had the same problem if using the manual controls in repetier, solved mine by g-code, G92E0 reset extruder and then G1E100F30 to extrude 100mm at speed 30mm/min, slow but it is accurate atleast for me.