depositing adhesive droplets to bind a powder, cutting and laminating sheets of paper, and shining a laser beam to fuse metal particles. Businesses already use 3-D printers to model products before producing them, a process referred to as rapid prototyping Companies also rely on the technology to make objects with complex shapes, such as jewelry and medical implants. Research groups have even used 3-d printers to build structures out of cells with the goal of printing living organsdepositing adhesive droplets to bind a powder, cutting and laminating sheets of paper, and shining a laser beam to fuse metal particles. Businesses already use 3-D printers to model products before producing them, a process referred to as rapid prototyping. Companies also rely on the technology to make objects with complex shapes, such as jewelry and medical implants. Research groups have even used 3-D printers to build structures out of cells with the goal of printing living organs