Still thinking that later on with just the beads it's still a longs progress for making your own filament, because to get good and decent prints that, you want to use as molds or replica's of cars, you don't want any offset in your filament. A home based filament extruder has a large error margin when you want to make 1.75 or 3 mm filament and this comes back in your print with not enough or too much extrusion.