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My first idea: Check the tightness of the big bolt that holds the two white gears and one roller. As I recall, if too loose the rollers don't turn properly. I also seem to remember that if too tight things don't turn at all.

I hope this helps.
Larry

My H1.1, Rambo, Repetier setup was behaving similar to what you describe. Turned out I did not have the USB driver installed. John installed it and things started working properly. This was in person - I don't know where you can find the driver.

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