externintextrudemultiply;// Sets extrude multiply factor (in percent) for all extruders
externboolvolumetric_enabled;
externintextruder_multiply[EXTRUDERS];// sets extrude multiply factor (in percent) for each extruder individually
externfloatfilament_size[EXTRUDERS];// cross-sectional area of filament (in millimeters), typically around 1.75 or 2.85, 0 disables the volumetric calculations for the extruder.