Protopasta Conductive PLA is an electrically conductive composite 🏷️#3d-printer-filament from Protoplant that compounds conductive carbon black into a 📝PLA base, letting printed parts carry low-voltage current.
The filament prints with standard PLA settings — no heated bed or special nozzle required — which makes it one of the most accessible routes to printed electronics. Typical resistance is 2.0–3.5 kΩ per 10 cm of 1.75 mm filament, and the effective resistance of a printed part varies with geometry, layer adhesion, and print settings. It ships in 50 g coils and 500 g, 1 kg, and 2 kg spools in both 1.75 mm and 2.85 mm diameters.
Its practical range is low-voltage work: simple circuits, capacitive touch sensors, LED integration, and experimental uses like ESD-safe fixtures. The carbon loading makes the composite stiffer and more brittle than unfilled PLA, so it rewards gentle filament paths and dry storage. Within the material's family it behaves like PLA thermally while trading some toughness for conductivity — a trade that suits interactive objects and prototypes rather than structural parts.
This is the filament that broke me and brought me back. After four weeks fighting to get first-layer adhesion with my 📝Ender 3 V2 for a conductive print of Thor's hammer, I gave up on 3D printing entirely. Five years later, a new friend on 📝Reddit reminded me that printer tech had come a long way in that time and described printing with their 📝Bambu Lab X2D as "largely set it and forget it". After purchasing an X2D of my own, I printed with the same years-degraded spool of filament flawlessly on the first attempt. I wouldn't recommend printing with this filament without a heated bed and heated enclosure, but it's an amazing material to work with otherwise.