Slic3r
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2. Slic3r
And Slic3r for Linux is the Open-Source Tool you need to Convert a 3D Model (STL, OBJ, AMF) into Printing Instructions for your 3D Printer.
It Cuts the Model into Horizontal Slices (Layers), Generates Toolpaths to Fill them and Calculates the Amount of Material to be Extruded.
How to Install Slic3r on GNU/Linux Desktops
Slic3r Installation Guide