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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The STL files are fine. The gcode is created by the slicer software you use. The issue is either bad slicer software, or possibly a bad SD card. Creality has had issues with the SD cards having corrupt memory. Try a different slicer, and/or try a different SD card.