we are a plastic filament factory, we have lots of years experience producing.
I think the small kit your mension is too small and not that safe. as in plastic industrial ,we will use below machine to make big bulk plastic goods breaking to piece small enough to drop to
extruder.
the machine price range from $451 to $1935, I think the cheap one is power enough.
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another choice, you can buy cheap filament from us directly from China .
$22 for 800gram, include shipping, tax free, go by post.