I have the monoprice IIIp printer and have been having good luck with it. I have upgraded to the model 4 extruder gear that has the finer teeth and when I try to adjust the steps It will not get it down to 100mm. When I first started it was way off at 81mm when I tried to get 100mm. So I did the math and changed the original steps from 96 to 118.54. That got me to 91.22mm out of 100. so again I did the correction and changed it to 129.95. now it still only extrudes 92mm even after the changes. I have done this a couple times with the same result. I am using repiter and using the config window and also using the manual control tab selecting the 100 on the extruder assuming that it is suppose to extrude 100mm of filament. Any help would be greatly appreciated.