A bespoke G-code file ushers the model into reality! Adjust the parameters to meet your needs, scale, and quality preferences. Open the STL file in a slicer to begin the slicing process. Conclusion So, How Do You Convert STL to Gcode File?.What Is the Difference Between STL and Gcode?.4 Easy Steps for Converting STL Files to G-code.So, How Do You Convert STL to Gcode File?.