How long would it take to fabricate this hollow pyramid using FDM? The square base has a side length of and the pyramid is tall. The interior cavity is also a pyramid with a square base of sides and a height of . Assume the extrudate of ABS and support material both have a cross-section of wide by tall and is dispensed at a rate of . The stage takes to move and it takes to switch between materials. The support material has a volumetric fill ratio of . Volume of a pyramid =