Researchers from the Polytechnic University of Catalonia (UPC) in Barcelona developed a new method of designing porous scaffolds for FDM 3D printing using a dual-extruder Sigma 3D printer from BCN3D to fabricate three sample scaffolds out of PLA, and then measuring their pore size and total porosity. They applied their model to a disc shape and defined three different variables: Distance between parallel planes; Number of base points for columns on each plane and Radius of each column.

Source: www.mdpi.com/1996-1944/11/9/1532