GPX is a post processing utility for converting gcode output from 3D slicing software like Cura, KISSlicer, S3DCreator and Slic3r to x3g files for standalone 3D printing on Makerbot Cupcake, ThingOMatic, and Replicator 1/2/2x printers - with support for both stock and sailfish firmwares.

G-codes are plain-text files containing instructions for controlling CNC milling machines and consumer-grade 3D printers adapted from CNC milling machines.