GPX in a GUI wrapper that will probably stick to your fingers

View on GitHub Documentation Release Page Download setup.exe Download for Mac

GpxUi is a graphical user interface wrapped around GPX, a command line utility.


Should work on Windows (tested on Windows 10), Mac (tested on El Capitan) and Linux (tested on Kubuntu 15 and 16).

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.

This GpxUi includes gpx.exe for use as a plugin to slicers, but also includes a settings editor and setup program to make it easy to get GPX set up and running with the right settings. Also includes a machine settings editor so you can mess with arcane stuff like how many steps per mm.



  1. Download and run setup.exe from the releases page


  1. Download a GpxUi.dmg from the releases page
  2. Open the GpxUi.dmg file and drag the GpxUi app to your Applications folder
  3. Run GpxUi from the Launcher


  1. Build it from source (instructions below) and do make install
  2. run “GpxUi”


  1. Choose your printer type
  2. Choose the gcode flavor of the slicer you want to use
  3. Click “Save” to save those two settings into gpx.ini
  4. Click the translate button, it’ll ask for the name of the gcode file and the name of the output x3g file


The setup added gpx.exe to your path, so you can easily add it as a post processor to Slic3r:

  1. Put Slic3r into expert mode via File.Preferences from the menu bar and restart Slic3r
  2. Choose “Print Settings” tab, “Output options” panel
  3. In “Post-processing scripts” type “gpx.exe” all by itself without quotes or parameters

Mac Note

Windows Notes

It added to the end of your path, so if you have a gpx.exe somewhere else on your machine and on your path, it won’t read the settings you set in GpxUi because the other one will win and it won’t know where these settings are.

You can switch the settings around and gpx.exe will just use whatever you saved last. Settings are also saved when you use GpxUi to translate a file.

Setup added an icon to your desktop and to your start menu. If you like a clean desktop like me, drag the desktop one to the trash, you can still run it from start. Seems like letting you drag it to the trash was easier than bothering you with a question in setup.

GpxUi includes an auto-updater courtesy of Squirrel for Windows. It checks for updates when you start it. So if you leave it running or never run it, it doesn’t update. Plus it has a limiter on it so it doesn’t check every time you boot it up, just when it has been a while. You can turn this off on the Help.Updates… menu.

Future features


Build instructions

  1. Clone the repository
  2. Get the submodules git submodule update --init
  3. Install QT and make sure it and the mingw32 it includes is on your path, I run gnu make under bash so I may have introduced a build-time dependency on bash
  4. make for the debug build or make release for the optimized build

For Windows setup.exe: make For Mac dmg: make macdeployqt CODESIGNID="signature name"

Ubuntu build instructions

  1. Clone the repository git clone
  2. Get the submodules git submodule update --init
  3. Install qt5 tools and libraries sudo apt-get install qttools5-dev-tools qtbase5-dev
  4. make for the debug build or make release for the optimized build
  5. make install