Buyers should prioritize filling accuracy (typically ±1% to ±2%) to ensure dosage consistency. Look for machines with PLC control systems and HMI touch screens for precise parameter adjustment. The cooling tunnel length and temperature control range are critical, as they determine the solidification speed and final product appearance. Additionally, ensure the machine supports multiple mold shapes (torpedo, bullet, or conical) and has a production capacity (e.g., 3,000–6,000 pcs/h) that aligns with your manufacturing scale.