When evaluating Gongzheng printers, focus on the Printhead Technology (typically Epson i3200, Ricoh G5/G6, or StarFire 1024) as this determines speed and resolution. Ensure the Frame Stability is industrial-grade to minimize vibration during high-speed printing. Key metrics include a Resolution of at least 1440 DPI for high-quality graphics and a Printing Speed that aligns with your production volume (e.g., 80-120 sqm/h for mid-range models). Additionally, verify the Ink Compatibility (Eco-solvent, UV, or Sublimation) to match your specific substrate requirements.