What is the thermal conductivity of various 3D printing filaments? **Thermal conductivity** is how well a plastic conducts heat. Most plastics don't conduct heat very well at all, which is what allows them to be 3D printed. That being said, there are a lot of potential use cases for highly thermally conductive filament, assuming you could print them. A commonly discussed one is computer heatsinks. Similar heatsinks could also be used for stepper motors and extruders in 3d printing. To get a good picture which plastics are useful in such an application (like mentioned in question: "Water-cooling stepper motor with aluminum block"), I need to know what is the thermal conductivity of the commonly used thermoplastics.

All values are in W/(m*K).

* PLA: 0.13
* HIPS: 0.20
* ABS: 0.25
* PETG: 0.29
* PEEK: 0.25
* PLA with copper: 0.25 (see discussion)
* PETG with 40% graphite: 1.70 (ansiotropic)
* TCPoly: 15
* Steel (not a 3dprintable plastic): 10 - 50



![enter image description here]( ![enter image description here](