Proto-pasta CDP11705 Composite Conductive PLA, 1.75 mm 500 g, Black

This does exactly what I wanted. I can use it as low-temp solder and apply it directly to metal wires to make low resistance joints. This plastic seems somewhat less hard than normal PLA, I have not found brittleness to be a problem. The resistance is hard to measure and seems to vary depending on the voltage potential across the plastic. Measuring the resistance of my first circuit (w/o voltage connected obviously) disappointed me with a really big number; however, when I turned on the power and the LEDs winked on I was not disappointed at all! Filament runs at PLA temperatures and smells mildly of PLA-Waffles. ABS temperatures do not appear to burn the filament. The MSDS for this product (posted on Proto-pasta's website) notes that the conductive polymer could potentially be bad for people HOWEVER it is completely encapsulated in plastic and should remain inaccessible to biology. Combine that with the fact that PLA can biodegrade; store this stuff carefully, keep it dry, discard scraps. This is new technology. So far I have enjoyed using this filament with my new MYNT 3D pen. I have had a prusa mendel for about 2 years but haven't actually run this through the printer yet. The cardboard spool is cool. I didn't expect to like that but it's lightweight and you can easily punch a hole to hook the filament for storage (that way you don't have to cut off a foot of filament like when the end doesn't line up with the pre-cut hole on a plastic spool).

Very finicky to print with. High impedance is not great for my purpose.

Worked just like pla+: tough, not stringy, with a matte finish. Much easier to work with than other "conductive pla" brands. Good value for the money, print quality is rarely an issue with the prusa mk4s. This holds true with this filament. It was a little sticky to the pei bed, but nothing a plastic scraper couldn't remove after it cooled down.

Ordered 3 spools and it was unusually brittle. Kept breaking off during feeding into the printer. Have tried other brands of conductive PLA with no issue. Not reccomended.

Four because it costs $100 a kilo but comes on the cheapest imaginable corrugated cardboard spool that keeps getting stuck in the AMS. I've printed dozens of spools with cardboard spools without a problem, will certainly make me think twice about buying from protoplasta again. That said, the filament itself is fine, prints well with stock settings, wasn't brittle and produced good prints. Using just using needle probes in a VOM, resistance was in the low kohm range over about 6". Probably low enough for shielding and strictly speaking, too low for anti-static. while you probably can't use it to carry useful power,, contact with it would cause an annoyingly hard to track down short. Treat it as a conductor and you'll be fine. Update: as I'm writing this and having to clear at least 4 jams so far, it may be more an issue with bad winding than just the spool, in any case, annoying for such an expensive product.