Besides plastics and metals there are also other materials that can be used for 3D printing, like for example concrete. Contour crafting is a technique that can be used for this kind of printing. It can be compared with FDM for plastics. With a giant nozzle a dense high-performance concrete will be added layer by layer. With this method walls can be formed. You can find an example in the picture beneath. The main advantages are the following:
- Hollow walls to make it lighter
- Higher strength than traditional housing walls
- Curved walls can be printed
- Savings in materials and human labour
- Fewer CO2 emissions and less energy consumption
The contour crafting machine is equipped witch a robotic arm that can place steel I-beams on the correct place to create doorways and windows. However, the machine is not entirely autonomous. There are still construction workers needed for the preparation and finishing.
This idea was invented by professor Behrokh Khoshnevis. What is your opinion?