BENTU DESIGN Creates 3D Printed Street Furniture from Urban Demolition Waste

BENTU DESIGN, a studio based in Guangzhou, has developed a project called Inorganic Growth that transforms construction debris from demolished urban villages into functional street furniture using 3D printing technology. The initiative addresses the significant volume of waste generated by urban clearance projects. The studio engineered a printable composite material containing up to 85% recycled solid waste, incorporating crushed concrete, brick fragments, mortar, fly ash, slag powder, and silica fume to create a cementitious substance with structural integrity. The resulting furniture pieces, including a chair named PU and a stool named YOU, visually reference their source sites through color tones extracted from the demolished neighborhoods, such as iron-red brick hues, cement-gray concrete shades, muted greens, and glazed tile blues. Dual print heads distribute inorganic pigments along the vertical axis, producing gradual color transitions that resemble geological layers, each representing the accumulated history of the vanished locations. A mobile processing unit stationed at demolition sites handles crushing, sorting, and printing sequentially, reducing transportation-related carbon emissions by approximately 70% and achieving a 92% material utilization rate. The 3D printing process cuts carbon output by 65 to 80% compared to conventional concrete prefabrication, while intelligent slicing algorithms reduce material consumption by about 40%. The project emphasizes material continuity, embedding traces of former environments into public objects.