The extruder head in a fused-deposition modeling setup has a diameter of 1.25 mm (0.05 in.) and produces layers that are 0.25 mm (0.01 in.) thick. if the extruder head and polymer extrudate velocities are both 40 mm/s, estimate the production time for the generation of a 38-mm (1.5-in.) solid cube. assume that there is a 15-second delay after deposition of each layer as the extruder head is moved over a wire brush for cleaning. (4 points)