HP Scalable printing technology : Scalable printing technology (SPT) is HP's new entry into the printing and imaging market. It's a whole new thermal inkjet technology that's been developed from the silicon on up. Scalable printing technology puts all of the printhead technologies onto the printhead itself. There are 3900 nozzles on the printhead...each one printing and blazing away to give HP customers speed and quality. And, HP makes the entire printhead themselves in their own silicon wafer fab. The most notable benefits of scalable printing technology are speed and image quality. This technology is about four times faster than HP's previous technology, allowing customers to print a 4 x 6 photo in about 14 seconds.