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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Yes, i have just solved it. I think it's the extruder gear issue, it has misaligned due to unknown reason. LOL.

It's a real beauty! Thanks for the design again! I will make it a gift to one of my student!