I may be inserting it wrong, but as far as I can tell the polar 3D power connector is too loose and occasionally causes the motors to stop moving. I’m not sure why this seems to just have started happening but anyways, just wanted to post to the mailing list. using something to hold it to one side prevents it from stopping.
We took the Polar3D to Books by the Banks today where I demoed it. We had the same problem, the cable was very touchy and caused some print failures…it was disconnected/reconnected several times today which may have loosened it just enough.