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 noticed this problem as well with Cura (3.6 / 4.0 beta). I fixed it by very slightly decreasing the line width (from 0.4 to 0.396) which eliminated most of the infill and greatly improved the print time.