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I have printed this using Sli3r/repetier-host and Cura (Mac) on a Printrbot Simple. Cura does a much more accurate job on the fine print details and prints the large gear corners so that they are easy to tap apart. Slic3r / Repetier large corners are more fused together and require a bit of force to separate. This is using the same startup G-code / xyz and extruder calibration. Cura is worth a try if you have trouble separating the large corners; it seems to be a better slicer, at least on a Mac.