Troubleshooting Epson EcoTank Printers Losing Color After Maintenance in DTF Printing

Question:
I've been working with an Epson EcoTank printer that initially prints fine-sometimes 5, 10, or even 40 sheets-after a head cleaning or full maintenance. But then, the printer begins to lose color output. I've already replaced the printhead, the cleaning station, the flex cable, and even the electronic board, but the issue continues. Interestingly, nozzle checks show the printhead in good condition. What could be causing this problem, and is there a reliable solution for DTF printing with EcoTank models?

Answer:
Thank you for contacting us, and I sincerely apologize for not being able to get back to you sooner. I completely understand how urgent and frustrating printer issues can be, especially when they persist despite major part replacements. At BCH Technologies, we truly value your engagement and support-especially through our YouTube channel (https://youtube.com/@bchtechnologies). Your feedback helps us refine our technical knowledge and allows us to share solutions that benefit the wider printing community.

From your description, the issue is not with obvious hardware faults, since you've already replaced most of the major components. Instead, the problem often comes down to ink delivery system limitations, particularly in DTF setups.

1. The Role of DTF Ink Viscosity

Unlike standard dye or pigment inks, DTF inks have a higher viscosity. Epson EcoTank printers are originally designed for low-viscosity inks, so when DTF inks are introduced, the internal tubing and dampers may not provide sufficient flow during sustained printing. This explains why the printer initially performs well after a cleaning cycle (when the lines are freshly primed) but then loses color as the ink supply begins to lag.

2. Recommended Tubing Size

To ensure steady ink flow, it's recommended to upgrade the ink tubing to at least 1.8 mm inner diameter (ID). The wider tubing reduces flow resistance, allowing the denser DTF inks to travel more consistently from the tanks to the printhead. Using narrower tubing is one of the most common causes of intermittent fading or loss of color after a few sheets.

3. Damper and Ink Supply Pressure

Even with correct tubing, the dampers can sometimes restrict ink flow if they are not compatible with thicker inks. Consider upgrading to dampers specifically designed for DTF inks. In addition, make sure your ink tank system is well-ventilated; blocked vents can create negative pressure that prevents smooth ink delivery.

4. Cleaning and Maintenance Cycles

You've likely noticed that after a cleaning cycle, the print quality briefly recovers. This is because the cleaning cycle forces ink into the lines and clears any partial vacuum. However, without addressing the underlying flow restriction, the issue quickly returns.

5. Electrical and Mechanical Considerations

Since you've already replaced the flex cable and board, it's unlikely this is an electronic problem. Still, ensure that the carriage movement is smooth and that there are no micro-vibrations causing inconsistent nozzle firing. Additionally, double-check that the waste ink system isn't siphoning ink unintentionally.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. For this reason, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. However, we do offer an in-person evaluation and repair service through our local diagnostic facility (https://bchtechnologies.com/printer-repair-service). Given the high demand, our services operate on a first-come, first-served basis, which may mean waiting a few weeks for intake. We repair both full printers and individual parts, with clear instructions provided along the way. Since our rates may not always be the most economical, we encourage exploring self-help options through online research. You can start by browsing our YouTube channel (https://youtube.com/@bchtechnologies) and using the search function next to the "About" tab for specific topics. This tool is especially useful, as we've created hundreds of videos over nine years, and even we can't always recall each one from memory.

Thank you again for reaching out to us and for supporting BCH Technologies. We hope this information clarifies the cause of your EcoTank issue and gives you a practical direction toward resolving it in your DTF setup.