Replacement Ink Tubing for an Epson L1800-Style DTF Printer: Understanding 1.6 mm and 3.2 mm Tubing Sizes

Question

I have an Epson L1800-style printer and need to replace the tubing that runs to the printhead. The tubing assembly has six lines. Five of the lines appear to be about 1/16 inch, or approximately 1.6 mm, and the sixth line appears to be about 1/8 inch, or approximately 3.2 mm. The larger line feeds both white ink dampers. I am having trouble finding the correct replacement tubing. What tubing should I use, and how can I identify the correct size?

Answer

For an Epson L1800-style DTF or converted printer, the tubing setup you described is very common. These printers often use multiple smaller ink lines for the color channels and a larger line for the white ink supply, especially when the white ink system feeds two dampers from one shared line. Since white ink is heavier and more prone to settling, many conversion systems use a larger-diameter line to improve flow and reduce restriction.

In our own system, we do not usually describe the tubing only by inch measurements. Instead, we use our own tubing and connector naming system so it is easier to match the tubing with the correct fittings and connectors on our website.

The smaller tubing you mentioned, around 1.6 mm, corresponds closely to what we call C2 tubing. For this size, you can look at our 3 ft 1.8 mm ID 8-strand solvent ink tubing for large format printer CIS [https://bchtechnologies.com/products/3ft-1-8mm-id-8-strand-solvent-ink-tubing-for-large-format-printer-cis?_pos=3&_sid=7cfc34d96&_ss=r]. Even though you measured approximately 1.6 mm, this type of tubing is typically in the same practical range used for small ink-feed lines in converted Epson systems. Measurement can vary depending on whether you are measuring inner diameter, outer diameter, stretched tubing, or tubing that has been compressed around a barb fitting.

The larger tubing you described, around 3.2 mm, corresponds to what we call C3 tubing. For that size, you can look at our 2 ft 2.5 mm ID single-strand tubing for waste ink [https://bchtechnologies.com/products/2-ft-2-5-mm-id-single-strand-tubing-for-waste-ink?_pos=2&_sid=e02d01447&_ss=r]. Although this product is listed as waste ink tubing, the important part is the tubing size and compatibility with the fittings you are using. In your case, since the larger line feeds both white dampers, this larger tubing makes sense because it allows more volume to reach the white ink side.

One important detail is the way the tubing is sold. The smaller C2-style tubing is sold as a 3-foot order, and the larger C3-style tubing is sold as a 2-foot order. If you order multiple quantities, we normally ship the tubing uncut. For example, if you order multiple units, you should receive one continuous length rather than several separate short pieces. This is helpful because you can cut the tubing to the exact lengths needed for your printer's routing.

When replacing the tubing, pay close attention to a few things. First, make sure the tubing fits tightly on the damper and connector barbs. If the tubing is too loose, it can allow air leaks, which may cause ink starvation, missing nozzles, or unstable white ink flow. If the tubing is too tight, it can be difficult to install and may crack fittings or restrict flow if the tubing kinks near the connector.

Second, avoid sharp bends. This is especially important on the larger white ink line. White ink contains heavier pigment and is more prone to clogging, settling, and flow restriction. A kinked or overly tight bend can reduce ink supply to the white dampers and lead to printing issues such as weak white output, missing white channels, or repeated head cleanings that do not fully recover the nozzles.

Third, if the larger line splits into two dampers, inspect the splitter or Y-connector as well. Sometimes the tubing is not the only problem. A partially clogged splitter, hardened connector, or air leak around the joint can cause symptoms similar to bad tubing. If you are already replacing the tubing, it is a good time to check the condition of the fittings, dampers, and any white ink circulation or agitation components in the system.

Also, before removing the old tubing, it is a good idea to take several pictures of the original routing. Mark the channels if needed. On L1800-style systems, crossed lines or swapped channels can create serious color problems, and a white ink line connected incorrectly can cause ink-flow issues or contamination. If the printer has been converted for DTF, the layout may not match the original Epson factory ink routing, so the existing setup is your best reference.

Addressing printer issues can be a complicated affair because many of these problems require hands-on inspection and testing. For that reason, we are not able to provide remote troubleshooting, repair suggestions, or step-by-step support for individual printer repairs. We do offer an in-person evaluation and repair service through our local diagnostic facility, available here: BCH Technologies Printer Repair Service [https://bchtechnologies.com/printer-repair-service]. Because demand is high, we operate on a first-come, first-served basis, so it may take a few weeks before your printer can be dropped off. Our services are structured to repair either a whole printer or specific parts, with clear instructions on how to proceed. However, we understand that our rates may not be the most economical option for every situation. For that reason, we strongly recommend self-help through online research whenever possible. You can start by searching YouTube or visiting our YouTube channel homepage: BCH Technologies on YouTube [https://youtube.com/@bchtechnologies]. Use the search icon next to "About" on the right-hand side of the menu bar to search for specific videos. I receive dozens of questions every day asking where to find videos on specific topics, and after creating videos for the past nine years, it is difficult to remember every single one. YouTube's search function is usually the most efficient way to locate the right video, and it may also recommend helpful videos from other channels.

Thanks again for reaching out and for providing the tubing details. Based on your description, the smaller five lines would be matched with our C2-style tubing, and the larger white ink feed line would be matched with our C3-style tubing. I appreciate your support and hope this helps you move forward with the repair.