Proto-pasta CDP12805 Electrically Conductive Carbon Spool, PLA Composite 2.85 mm, 500 g, Black

At first I had the issue of the filament grinding and it would stop extruding. But after troubleshooting it was found to be my fault. The first layer was too close to the bed causing back pressure and eventually causing the hobbed bolt to grind up the filament and stop feeding.I also had the issue of the parts sticking too well to bare glass or pei, causing the print to stick to the bed and tear when removing. A light application of elmers purple glue stick resolved the over adhesion and I was able to then print 3 rolls on my Lulzbot Taz 5 perfectly.

I have not yet printed with this filament, but the packaging does not appear to be well sealed. According to protopasta, the filament is best run at ambient, but if this package goes through Houston to arrive to Arizona, it isn't going to go well...

I switched from this to a clear PETG and had several dark prints before it started to print clear (short prints). It's amazing how long this stuff hangs around.

We've had great results with our prints, with beautiful detail and quick relays to our Arduino hook up. The filament is surprisingly brittle. We store it in a bag with silica dessicant, but still have frustrating prints that snap mid print or right at the end. Snapping also occurs when loading. The biggest frustration is that the filament residue seems to be left behind. We've had a series of prints with black speckles deposited within the color. If the print isn't painted the end results looks really bad, especially if you're trying to make a clear print.

It printed well, even better than my other PLA and ABS filaments. I use it for basic ESD protection for electronics projects. Nice finish.