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MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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I had the same issue. Here is what I asked and how I fixed it (essentially tightening the Y axis belt).
http://www.thingiverse.com/groups/anet-a8-prusa-i3/topic:15196

Huge difference in quality of prints. Like night and day.