When sourcing a nail printer, the most critical technical factor is printing resolution, which should be at least 1200 DPI to 2400 DPI to ensure intricate designs and photos appear sharp on a small surface. You must also verify the printing speed; high-efficiency models can complete a single nail in 10 to 30 seconds. Additionally, check for AI nail recognition technology, which allows the machine to automatically identify the nail edge and contour for precise ink application without staining the skin.