Can Dave’s extrusion machine be used as it is for making 3D printer filament of market standards? The mods that Dave did later (automatic spools winder, caterpillar, etc) are they really necesary? Please reply as i’m thinking of starting a smaLL filament selling business. Every minute information will be useful
I’m also intrinsting about starting a small fillament selling business . 
http://rwgresearch.com/open-projects/filament-extruder/
He also made great filament like dave hakkens and he made a step by step tutoriel