多くの住宅は、建設現場で作業員が木材、れんが、コンクリートなどの材料を組み立てて建てられます。

READING

Most houses are built by workers who assemble wood, bricks, concrete, and other materials at a construction site. A newer method uses a large 3D printer. The machine follows a digital design and places layers of building material to form walls. Workers later add roofs, windows, pipes, wiring, and other parts that the printer does not produce.

Supporters say 3D-printed housing could be useful. Once the site and machine are prepared, walls can be produced quickly with fewer repeated manual tasks. This may shorten the early stage of construction when skilled workers are scarce. Another advantage is that the printer places material according to an exact design. Using only the required amount can reduce leftover concrete or other waste from cutting and shaping building parts.

However, critics have concerns. Printers cannot yet produce every part of a complete home, and available materials may not suit all climates or building designs. Builders must still use traditional methods for many parts. There is another problem. Printed homes may require lengthy safety inspections because many building rules were created for traditional construction methods. As a result, obtaining approval can take time and delay construction projects.