3DPrinting

Wear gloves, eye protection, and an appropriate mask if you’re going to do any sanding. Carbon fiber is a great material, but if you breathe in the particulates from sanding, it could cause lung damage. I would imagine there is similar risk if it gets in your eyes (hence eye protection). The gloves suggestion was there because you feel concerned about skin contact.

The standard, “print only in well ventilated areas” always applied, because heat + polymers = noxious gases.

Here’s some good info that may give you what you’re looking good for:

https://www.osha.gov/otm/section-3-health-hazards/chapter-1#6

It's perfectly fine to handle. Carbon fiber in FDM 3D printing is largely a lie. It's not that there isn't carbon fiber in there, it's just that it's chopped up so finely that it's practically pointless by the time it's printed. At best, all it does is destroy any printer not set up to handle it. It's basically like printing sandpaper. Honestly, I'd avoid it entirely; same goes for glow-in-the-dark. Only reputable supplier I know for GITD is Das Filament, which ball-grinds their glow powder before inclusion into the stock.

If you're interested in real carbon fiber in FDM prints, the only people to really see are Markforged.