I've been looking into this material due to the really nice surface finish and clean look (actually purchased some already 😅)
However I recently came across a video by CNC kitchen where he raised some potential health concerns relating to the fibers specifically inside the filament. One of the commenters mentioned they couldn't wash the fibers off their skin, and another likened it to the "3d printing equivalent of asbestos"
I don't plan to print with it just yet due to needing a hardened nozzle, and spare extruder parts. However when I do, i'm feeling a little worried about how safe it is - mainly whether the final printed part is fine for occasional skin contact, or whether this material should ideally be left to just cosmetic parts.
P.S. image not mine, taken from here
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.
Interesting. Know any reseller in US for Das filament?
Sadly, no. I haven't bought any in a long time. I think CNCKitchen did a video on it: https://www.youtube.com/watch?v=ODQoQd-0ky8
Can you expand on the glow in the dark filament? Are you talking about abrasion/safety of your extruder, or safety of handling etc. I am not concerned about my extruder seeing that I am using a tungsten carbide nozzle, but I have made GITD stuff for kids (older ones, not young enough to be putting stuff in their mouth lol)
Safety for your equipment, not safety for handling. It's more than just your nozzle that touches this stuff - your heatbreak, PTFE if you're using a bowden setup, the drive gear, literally anything the filament touches WILL get destroyed unless made out of a suitable material. E3D, back when they first introduced hardened nozzles for printing abrasive filaments, learned this the hard way. They set up a machine with an overhead spool for a show, and just the filament running across the top bar of the machine, managed to put a GIGANTIC notch into the T-slot and near cut the machine in half. It was quite honestly hilarious to witness.
Oh wow, that's crazy, cutting a notch! Yeah, I only considered the nozzle, not all the other parts....