Fig. 2

Three different types of extruders are illustrated schematically. a Filament-fed extruder. b Screw extruder. c Syringe extruders with either a mechanically driven plunger or pneumatic pressure plunger
Three different types of extruders are illustrated schematically. a Filament-fed extruder. b Screw extruder. c Syringe extruders with either a mechanically driven plunger or pneumatic pressure plunger