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I had the same problem with the identical set up. I dropped the Repetier software and uploaded Pronterface software http://www.pronterface.com/ and it connected and works beautifully. It is currently as I type this printing out a model of Krakatoa using a HP Sprout Computer running windows 10. Last evening I printed a Cthulhu idol using my Mac with the Pronterface software and it looks amazing. It was a 6 hour print with no issues.