How to Split One White Ink Bottle Into Two Lines for an ET-8550 DTF Conversion

Question: During my ET-8550 DTF conversion, I only have one white ink bottle, but the printhead requires two white ink lines. How can I split one white ink bottle into two tubes so both white channels receive ink?

Answer:

How to Split One White Ink Reservoir Into Two White Ink Lines

For DTF conversions on the Epson ET-8550, the printer's printhead uses two separate white channels, even if you only have one white ink bottle. This setup is very common in DTF workflows, and fortunately, it's easy to split one ink source into two feed lines.

Below are the methods, parts, and best practices.

Option 1: Split the Line Using a T-Connector (Most Common Method)

You can divide one white ink line into two using a T connector.

Parts You Need

• T-Connector → Search for: AS-TUBE-Connector-TT3 at BCHTechnologies.com

• Tubing → Either:

  • AS-Tubing-ST2K-OR

  • AS-TUBE-25

Typical Installation Steps

1. Locate the single white ink line coming from your white ink bottle.

2. Cut the tube before it reaches the dampers.

3. Insert the first T-connector.

4. On the other white line (the second white channel), insert a second T-connector as well.

5. Use a short piece of tubing to connect the two Ts together.

This creates a balanced feed path by sharing one ink source across the two white dampers.

Why This Works

Both white channels will draw from the same supply, and connecting the two Ts stabilizes flow between them. This prevents one channel from starving while the other draws ink more aggressively.

Option 2: T-Connectors for Circulation Systems (White Ink Recirculation)

If you're running a recirculating white ink system, you'll need a slightly different configuration to maintain proper inlet and outlet flow.

How to Set It Up

• Place two T-connectors side by side in a configuration that looks like this:

==T = T==

• The single tube on one side becomes your recirculation inlet.

• The single tube on the opposite side becomes your recirculation outlet.

• The legs of each T will feed the two white dampers.

Why This Works

This creates:

• One inlet

• One outlet

• Two feeds

The system continues circulating white ink properly while still providing ink to both white channels.

Important Tips for Best Performance

1. Always Prime the Lines After Splitting

Make sure both white lines are fully primed so you don't introduce air into the printhead.

2. Keep the Split Lines the Same Length

This helps ensure even suction and prevents one channel from pulling more ink than the other.

3. Monitor for Sediment or Pigment Settling

White ink is heavy and settles quickly. Make sure:

• Your bottle is gently shaken daily

• Your recirculation system is functioning properly

• You flush lines periodically

4. Check for Backflow or Air Bubbles

If you see air entering one line, shorten or reposition your T-connections to reduce turbulence.

Important Service Note

Printer modifications-especially DTF conversions-are extremely hands-on, so we're unable to provide remote troubleshooting or step-by-step repair guidance. However, we do offer in-person diagnostic and repair work through our local facility:
➡ Local Printer Repair Service (https://bchtechnologies.com/printer-repair-service)

Because demand is high, printers are processed on a first-come, first-served basis, and there may be a waiting period before drop-off. We repair full printers and specific components with clearly outlined procedures. Still, our service rates may not always be the most economical option.

For DIY help, online research is often your best resource. You can start by visiting our YouTube homepage:
➡ BCH Technologies YouTube Channel (https://youtube.com/@bchtechnologies)

Use the search icon next to the "About" tab to locate videos on specific techniques. With nearly a decade of videos, the search tool is the most efficient way to locate what you need, and YouTube may suggest helpful content from other creators as well.

Thank you again for reaching out and for your continued support of our products and tutorials. We truly appreciate your involvement and are always here if you need help finding specific parts or supplies.