Setting up a UV Flatbed printer—like our Locor A3 or the LC-6090—requires a high level of precision compared to standard eco-solvent machines. Because UV ink cures instantly under LED light, a “clean” setup is the difference between a crisp print and a ruined printhead.

Here are the best practices for setting up your UV Flatbed for success:

1. Environmental Control

• Dust-Free Zone: UV ink is tacky before it cures. Any dust in the air will settle on the media or the printhead, causing “deflection” (ink spraying in the wrong direction).
• Temperature & Humidity: Aim for a stable room temperature between 20°C and 28°C. If it’s too cold, the ink becomes too viscous (thick) and won’t flow; if it’s too hot, you risk the ink curing prematurely inside the nozzles.
• No Direct Sunlight: Ensure the printer is not near a window. Natural UV rays from the sun can cure the ink sitting in the dampers or the printhead nozzles, causing permanent blockages.

2. Media Preparation & Leveling

• The “Gap” Rule: Always maintain a distance of 2mm to 3mm between the printhead and the material.

  • Too high: Your prints will look blurry or “foggy.”
  • Too low: You risk a “head strike,” which can destroy an XP600 head instantly.
• Level the Bed: Use a spirit level to ensure the flatbed is perfectly horizontal. If the bed is tilted, the printhead-to-media distance will vary as it moves, leading to uneven print quality.
• Surface Cleaning: Wipe every item (glass, acrylic, phone cases) with 99% Isopropyl Alcohol and a lint-free cloth before printing to remove fingerprints and oils.

3. Ink & System Priming

• Shake the White Ink: White UV ink contains heavy titanium dioxide which settles at the bottom. Before the first print of the day, gently shake the white ink tank or ensure the automatic circulation system is running.
• Air Bubble Removal: When first filling the dampers, ensure there are zero air bubbles. Air in the lines will cause the colors to “drop out” halfway through a print.
• Check the Chiller: Ensure the water-cooling system for the UV LED lamps is filled with distilled water and running. If the lamps overheat, they will shut down or burn out.

4. Software & Calibration

• Step & Bi-Directional Alignment: Run the alignment patterns from your RIP software (Maintop or PhotoPrint). This ensures that the dots dropped while the head moves left match the dots dropped while moving right.
• White Ink Layering: Set up your “Under-base” correctly. For transparent or dark materials, you usually want to print: White Layer > Color Layer > Varnish Layer.

5. Daily Maintenance (The Golden Rules)

• The Daily Nozzle Check: Never start a job without a nozzle check. It takes 30 seconds and saves thousands of Rands in wasted media.
• Wet Capping: At the end of the day, ensure the printhead is “seated” perfectly on the capping station. The cap should be clean and slightly moist to keep the head from drying out overnight.
• Wipe the LED Glass: Use a dry cotton bud to gently wipe the glass covers on your UV LED lamps. If ink mists onto these lamps, they will lose their curing power.