32.2) A tube with a rectangular cross section is to be fabricated by Laser Powder Bed Fusion. Outside dimensions of the rectangle are 40 mm by 80 mm, and the corresponding inside dimensions are 30 mm by 70 mm (wall thickness = 5 mm except at corners). The height of the tube (--direction) - 50 mm. Layer thickness - 0.040 mm, and laser spot diameter - 0.125 mm. The beam velocity across the powder bed is - 800 mm/s. a) Compute an estimate for the cycle time to build the part vertical without support structures, if 15s are lost each layer for repositioning and recoating. Ignore setup time. b) The metal powder used costs $150/kg and the density is 7.8 (g/cm). The LPBF machine cost rate - $20.00/hr. Assume that all of the metal powder not used for the part can be reused. Labor rate = $65.00/hr, but labor utilization during the build cycle is only 10%. Post- processing time - 30.0 min/part. Using the cycle time from b), determine the part cost