externintextrudemultiply;// Sets extrude multiply factor (in percent) for all extruders
externintextruder_multiply[EXTRUDERS];// sets extrude multiply factor (in percent) for each extruder individually
externfloatvolumetric_multiplier[EXTRUDERS];// reciprocal of cross-sectional area of filament (in square millimeters), stored this way to reduce computational burden in planner