Buyers must prioritize ink chemistry (Dye-based vs. Pigment-based). Dye inks offer vibrant colors for indoor posters, while pigment inks provide superior UV resistance and water-fastness for outdoor signage. Ensure the chip compatibility matches your specific plotter model (e.g., DesignJet, SureColor, or imagePROGRAF) to avoid 'non-recognized' errors. Additionally, verify the milliliter (ml) capacity to calculate the cost-per-milliliter, ensuring it aligns with your high-volume printing requirements.