I have both, the black does not extrude correctly and clogs the the nozzle. The white works fine.
The black is rough to the touch, the white is smooth as glass.
Looking at the black under magnification it is cracked and covered with clearish crystals.
I sent email with pics to tech support and they promptly shipped me a new roll.. It is identical to what I had and from a different lot.
So can anyone explain why they are so different in physical appearance??
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