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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In the Slic3r Prusa Edition software, load the STL file of your choosing, then click on "split", highlight one piece you want to delete, and press the delete key on your keyboard, or right click the part and select delete, until you're left only with the part you want to print. Then export the STL or if you're ready to print, the gcode file.