| Small drop size | Approximately 3–5 pL | Requires stable viscosity, clean nozzles, and accurate waveform control. Small particles or partially dried ink can affect drop direction quickly. | Medium to High | Use filtered ink, keep the capping station moist, and perform regular nozzle checks. | Produces fine detail but is less tolerant of contamination and long idle periods. |
| Medium drop size | Approximately 6–9 pL | Offers a balance between image detail, ink delivery, and nozzle tolerance. | Low to Medium | Maintain stable temperature and use the printer manufacturer's recommended waveform settings. | Often suitable for general DTF graphics when ink condition and maintenance are consistent. |
| Large drop size | Approximately 10–12 pL | Delivers more ink per firing cycle and may be less sensitive to minor flow variation, but can increase ink load and drying time. | Low to Medium | Control ink laydown, drying temperature, and white-ink circulation. | Can improve coverage, but a larger drop alone does not guarantee clog resistance. |
| Resolution near 600 dpi | About 600 dots per inch | Places many firing events and ink droplets in a limited area. Stable drop placement becomes important for smooth solids and gradients. | Medium | Use correct pass mode, avoid excessive heat, and confirm that the ink is compatible with the printhead. | Higher resolution can improve detail, but it increases the need for consistent ink delivery. |
| Ink viscosity | Common aqueous piezo-ink operating ranges are often around 2–6 mPa·s at a specified test temperature; always follow the ink specification. | Viscosity that is too high can restrict flow, while viscosity that is too low can reduce drop stability and increase misting. | High if unstable | Measure or verify viscosity at the stated temperature rather than comparing values taken at different temperatures. | Viscosity is one of the key indicators, but it must be considered with surface tension and waveform settings. |
| Surface tension | Often approximately 25–40 mN/m for aqueous inkjet formulations, depending on the formulation and test method. | Controls wetting, meniscus behavior, and drop break-off at the nozzle. | Medium | Use ink designed for the specific printhead and avoid mixing fluids with different surfactant systems. | Incorrect surface tension may cause satellites, poor wetting, or unstable jetting even when viscosity appears correct. |
| White ink pigment load | Higher than typical color ink because white coverage depends on titanium dioxide pigment. | Heavier pigment systems require effective dispersion and circulation to reduce settling. | Medium to High | Use continuous or scheduled circulation, gently agitate storage containers, and print a maintenance pattern during idle periods. | White ink is usually the first ink system to inspect when recurring clogging occurs. |
| Particle filtration | Fine filtration is commonly used before ink reaches the printhead; exact filter rating depends on the printhead and formulation. | Removes agglomerates that could obstruct narrow nozzle channels or disturb drop formation. | Lower when effective | Use compatible filters and replace them according to pressure, flow, or maintenance requirements. | Filtration reduces contamination risk but cannot correct ink that has chemically destabilized or dried. |
| Printer operating temperature | Usually controlled within the range specified for the printhead and ink system; many aqueous systems operate near normal room temperature. | Temperature changes alter viscosity and therefore affect drop velocity and placement. | Medium | Keep the printer room stable and allow ink to reach operating temperature before judging nozzle performance. | A stable environment is generally more important than selecting an extreme temperature. |
| Idle time without maintenance | Risk increases from several hours to multiple days, depending on humidity, capping quality, ink chemistry, and printhead design. | Water evaporation can increase local viscosity at the nozzle plate and form dried deposits. | High during long idle periods | Use automatic maintenance routines, seal the printhead correctly, and follow the recommended shutdown procedure. | Even well-formulated anti-clogging ink can clog if the nozzle area is left exposed to dry air. |
| Ink age and storage | Use within the manufacturer's stated shelf life and storage temperature range. | Aging, freezing, overheating, or repeated contamination can change dispersion and flow behavior. | Medium to High | Store sealed containers away from direct sunlight and avoid repeated opening or mixing of incompatible inks. | Fresh, correctly stored ink is more predictable than ink selected only by its advertised clog-resistance claim. |
| Ink compatibility | Must match the printhead, dampers, tubing, filters, capping materials, and curing process. | Incompatible chemistry may cause swelling, sedimentation, poor wetting, or unstable jetting. | High if incompatible | Request technical data, conduct a controlled nozzle test, and avoid mixing different ink systems without verified compatibility. | The best anti-clogging ink is the one whose physical and chemical properties match the complete printer system. |