So i have been printing a few calibration boxes through thingiverse and all seemed to go well. This is my first print. I decided to try to print a gear from wades extruder and it was going great but it appeared to go south during the middle of the print. The print began drifting during the second half of the gear. I have a Hic Prusa i3 with Marlin. I have checked the belt and set screw on the gear (Y axis) but all seems fine. I have been slicing with Slic3r and printing with repetier server. Here is the url to the gear. http://www.thingiverse.com/thing:65939/#files

I am trying to print the biggearmod_fixed_1.stl. If you look at the gear, the first half prints fine, but at the start of the second half, all goes wrong.



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