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I've printed many successful prints, but I just can't seem to dial in on the right settings for the gear cube found here: http://www.thingiverse.com/thing:50716. The corner edges of the parts start to curl up on about the 10-15th layer. Any ideas? Here are the settings I'm using in Slic3r: 40mm/sec ...

You were absolutely right about the connection on the stepper motor pins not being tight/fully connected. I redid my crimps and made sure all of the stepper motor wires were securely pushed into the 4 pin connectors and that did the trick...G28 works like a charm now!

Thanks for the help!

I've triple checked the wires and that can't be the issue. I just ran G28 again and let the X and Z skates hit the end stops (while the Z remained vibrating in place versus moving up or down). The X and Y stopped as they should at the end stops and the Z kept vibrating. After resetting the maching ...

I just finished my Rostock Max setup and am trying to calibrate for the first time. I've flashed the most up-to-date Marlin firmware, etc. When I send the G28 command in Repetier, the X and Y skates move up, but the Z vibrates up and down slightly by about 1/4 inch. I've tightened the stepper driver ...