Abstract: A fused filament fabrication (FFF) machine includes a cabinet defining a build chamber for building a workpiece including a part and a sacrificial tower for the part at a build location. A head assembly has a filament dispenser for dispensing media through a liquefier tip at the build location during a build process. A controller is operably coupled to the head assembly to control the position of the head assembly and dispensing of the media during the build process. The controller periodically moves the head assembly away from the build location to a tip wipe assembly to clean the liquefier tip during a tip wipe process. The controller moves the head assembly from the tip wipe assembly to dispense a sacrificial slug of material away from the part after the tip wipe process before deposition of the material into the part.