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Recently, Dar Al Arkan, a real estate company in Saudi Arabia, announced their newly completed project: a 3D printed 3-story villa with a total height of 9.9 meters, which is the tallest on-site 3D printed building in the world.     The villa is located in Shams Al Riyadh, northwest of the Saudi capital city of Riyadh, covering a total area of 12 million square meters. The villa has a construction area of 345 square meters, with a first floor area of 130 square meters, including a spacious hall and several living areas, a kitchen, and two toilets. The second floor covers an area of 140 square meters and has three bedrooms (one of which is the master bedroom), two bathrooms, a living room, and a balcony. The third floor is the rooftop annex building, which includes a maid's room with a bathroom, a multipurpose hall, and a laundry room. Although it is a three story villa, in Saudi Arabia, such a building is called a two-story+annex building because the third floor is lower and smaller than the first and second floors.   The 3D printer used is COBOD, which is made of 99% ordinary concrete material and 1% special formula material, with a material cost of approximately 71086 yuan.   Currently, Dar Al Arkan has started printing the second villa. Project manager Wael Al Hagen introduced, "We are currently building a second villa, which usually takes a month to complete, but we have already completed the first floor of 130 square meters in just 8 days. This 3D printed villa has additional insulation layers and energy-saving features, which can save 30% of energy consumption   The desert areas of Saudi Arabia are extremely hot in summer, and if construction is carried out in summer, large tents need to be set up. By using a 3D printer, there is no need to build a large tent. Dar Al Arkan stated that they will promote the application of this technology in Saudi Arabia's future buildings.