I have some Fiberology PA12+CF15 blend (link) from a long time ago and recently got around to using it. I am amazed to say the least! It prints easier than PETG, even without an enclosure. Only downside is that it is much more expensive per kg, although it is lower density so I don’t seem to be going through it as quickly as other filaments.
I recently purchased some PC Blend with CF from Prusa as well. I haven’t gotten to print it yet, but I’ve heard very good things about it, too.
What less common filaments do you fine folks like using?
I like ABS/ASA because it sands and polishes really nice.
By far the strongest filament I have made structural parts from is Prusament PC blend.
Can you vapor smooth ASA?
Yes, it’s soluble in acetone, quite similar to ABS.
you might also like the metal-fills. I use protopasta’s bronze and and iron fill. You can get pretty decent finishes. More interestingly, you can let them tarnish/rust (or, you know, help that along,)
Got a few friends that keep bringing reels of the stuff around for their cosplay builds. expensive as hell, though.