“…Other polymeric materials used in FFF technology are polycaprolactone (PCL), polycarbonate (PC), polyamide (PA) or nylon, polypropylene (PP), polymethyl methylacrylate (PMMA), polystyrene (PS), polyetherimide (PEI), and various types of polyethylene (PE), including low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), and polyethylene terephthalate (PET) [ 5 , 32 , 45 , 49 , 52 , 55 , 56 , 57 , 60 , 61 , 62 ]. A combination of the polymeric materials has been used in some scientific publications, such as ABS and PC, PLA and PC, PE and PP, and so on [ 32 , 60 , 62 ].…”