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PA6-CF vs PA6-GF - Impact Toughness vs Brittleness
(fosscad.io)
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Compared to PLA+: 3 - 5x more expensive, much higher heat tolerance, somewhat lower stiffness, needs a 300+°C hot-end, prints best in an enclosure. Strength is comparable (there are differences but it's not dramatically better or worse).
I don't use regular PLA for anything.