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Also, do you know where to get a pellet extruder? Or how to make one? I image you can run a stepper motor to run the drive screw like a filament extruder but how can you regulate flow more precisely? Will you need to run a sensor to measure the flow? then you will need a controller to change screw rotation speed? I have heard of pellet extruders used in huge 3D printers that extrude up to 5 kilo per hour. Any ideas how to speed up printing without killing your quality of print?/