What is a .GCO file?
A .gco file is G-code for a 3D printer or CNC machine. Produced by slicers like Cura and PrusaSlicer.
- Did you know
- The clipped .gco name exists because many 3D-printer firmwares read SD cards using DOS-style 8.3 filenames, leaving room for only three letters after the dot.
- The “G” in G-code marks a preparatory command, the family of moves and modes the controller prepares before acting.
- Alongside G-words, M-words handle miscellaneous functions such as turning a spindle, fan or coolant on and off.
- What Analyser shows you
- Reconstruct and visualise the printed (or machined) object straight from G-code: every extruded move is drawn as a line in an interactive WebGL viewer, height-coloured and Z-up, with a build-height scrubber to peel the print back layer by layer. Works universally across slicers (PrusaSlicer, SuperSlicer, OrcaSlicer, Cura, ideaMaker, Bambu Studio, Simplify3D) and CNC / laser CAM, handling absolute and relative moves, inch and millimetre units, and G2/G3 arcs; travel moves are separated out. Reads the slicer or CAM tool, object size, layer count and height, filament or cut-path length, feedrate range, and nozzle/bed temperatures. NC programs written to DIN 66025 (the German standard behind ISO 6983, used by Heidenhain and Siemens Sinumerik controls and commonly saved as .din) are read by the same viewer.
- Open a .GCO file
- Drag a .GCO file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.