Pla-cf is generally more brittle because of poor layer adhesion due to the fact that carbon fibre doesn't stick to carbon fibre. Pla also doesn't need the additional stiffness CF provides so it's just a gimmicky filament.
PLA-CF isn't a high strength filament, but I do really like it for large functional prints that need to be stiff and look good. It has a nice texture right off the printer.
kube-system|8 months ago