Lowest thermally conductive material for 3D printing?

[Engineer43]

Anyone have any suggestions for a strong material that can be used in a 3D printer, but has super low thermal conductivity?

[Enthalpy]

Among solids, you won't get a thermal conductivity much lower than any polymer has. Alas, they aren't mechanically strong.

Maybe the answer is to optimize the shape instead. Take a good material, adapt the design to its possibilities.

How necessary is the 3D printer? Maybe you could prints some parts of your design, and add a few ones manually, like tensile aramide strings that hold the insulated part to the rest. Or enclose the insulated part in a bed of cork that is only compressed.