Ok thank you very much. One more question. The arm really didn't fit into the idler piece. Does that mean I am over-extruding? I feel like there can't be more than just a few percents in that case because the models come out very nicely with no blobs or irregularities otherwise. Would 1-2% of overextrusion really make that much difference? I had to file down the arm and the idler quite a bit. Are they a really tight fit in usual case?