Although 3D printing promises a revolution in many industries, primarily industrial manufacturing, nowhere are the possibilities greater than in the field of product design and modular architecture. Ronald Rael and Virginia San Fratello, of the cutting-edge San Francisco-based design firm Emerging Objects, have developed remarkable techniques for printing from a wide variety of powders, including sawdust, clay, cement, rubber, concrete, salt, and even coffee grounds, opening an entire realm of material, phenomenological, and ecological possibilities to designers. In addition to case studies and illustrations of their own work, Rael and San Fratello offer guidance for sourcing alternative materials, specific recipes for mixing compounds, and step-by-step instructions for conducting bench tests and setting parameters for material testing, to help readers to understand the process of developing powder-based materials and their unique qualities.