Nipple Conversion for Epson ET 8550

Epson ET 8550 is a versatile printer with many features, but for those looking to maximize its capabilities, a nipple conversion on the printhead can be highly beneficial. This guide will walk you through the process of converting the printhead ink intake from a mesh input to a nipple input. By the end, you'll have a better understanding of the steps involved, from removing the printhead to configuring dampers for optimal performance. We’ve also included a video below to show you how it's done.

Removing the Printhead

Before getting started, it’s important to understand the layout of the Epson ET 8550 printhead. The first step in this process is to remove the printhead cover, which is secured by two tabs on the sides and two screws in the front. Carefully unscrew these screws and lift the cover off to expose the printhead assembly.

Now, remove the two screws from the transportation lock assembly. If your printer has been modified with a drag chain, you won’t need this assembly anymore. For this guide, we’ll demonstrate using both the original equipment manufacturer (OEM) tubes and clear tubes to ensure versatility for different setups.

Once the tubes are disconnected, the dampers can be detached from the printhead. Make sure to remove the ink from each damper using a syringe. Park the printer carriage on the capping station to allow the remaining ink to settle. It’s important to work slowly and carefully during this step to avoid ink spills.

Finally, flip the metal tab to lift the dampers vertically. After cleaning the dampers, remove the printhead by unscrewing the four screws holding it in place. Be prepared for some ink leakage, even if you’re careful. If the process seems overwhelming, BCH Technologies also offers a conversion installation service.

Waterproofing the Printhead

To protect your printhead from damage and ensure long-lasting performance, it's crucial to waterproof it properly. On the BCH Technologies website, you’ll find a silicone seal kit designed for this purpose. This kit includes a silicone seal and cleanup pads to manage any excess sealant.

Begin by applying the silicone seal to the printhead. Both the BCH Technologies silicone and the DTF Pro brand (available at dtfpro.com) offer effective waterproofing solutions. Both products are non-conductive, meaning you can apply them wet without waiting for them to dry.

Apply the seal around the edges of the printhead and the areas where ink is most likely to leak. This simple step will save you from potential damage and future repairs. Be sure to use the cleanup pads included in the kit to wipe away any excess silicone. As a final step in waterproofing, seal the FFC (Flat Flexible Cable), ensuring that it’s inserted correctly before applying the silicone.

Installing the Printhead Nipple Cover

Once the printhead is waterproofed, it's time to install the nipple cover. This part of the process is critical for the conversion, as it changes the ink intake system from a mesh input to a nipple input. First, remove the four screws holding the printhead base and gently lift the printhead.

Be careful not to disturb the black rubber seal at the base. This small piece is vital for maintaining a proper seal around the printhead, ensuring no ink leaks during operation. One important tip to keep in mind is the orientation of the printhead. The side with the serial number should face the side with two screw holes at the top.

Install the new base with the serial tab on the top and secure it with the four screws. Tighten the screws in a diagonal pattern to ensure even pressure across the printhead, which will help prevent leaks.

Waterproofing the Printhead After Installation

After installing the nipple cover, it's time to waterproof the printhead once again. Even though we’ve already applied silicone, it's important to seal any remaining areas that could be exposed to ink. This extra layer of protection will ensure that your printhead remains leak-free.

Apply silicone around the edges where the ink is likely to enter and use the cleanup pads to smooth out the sealant. Sealing the printhead properly can extend its lifespan and reduce the chances of future issues.

Installing and Configuring the Dampers: OEM Tubes Without Drag Chain

When reinstalling the printhead, you’ll need to connect the dampers. The dampers are crucial components in this process, as they regulate the flow of ink from the cartridges to the printhead. If your printer is using OEM tubes and doesn’t have a drag chain, there are a few additional steps to follow.

The V2 dampers used in this guide are slightly taller than ideal, meaning they may require some adjustment to fit properly. One way to fix this is by sanding down or trimming the top of the assembly to make space for the dampers. You can use a Dremel tool or sandpaper for this, as it’s a quick and straightforward process.

Once the dampers are in place, attach the tubes to the white damper, ensuring a secure fit. If needed, you can remove the top portion of the lock assembly to allow for more space.

Installing and Configuring the Dampers: Clear Tubes With Drag Chain

If your printer has been modified to use clear tubes with a drag chain, the process is slightly different. Clear tubes typically require different damper connections, and you may need an elbow connector to make them fit properly. For this setup, we recommend using a size 2 tube for the elbow connection to the damper.

By trimming the elbow connection, you can save more space on top, which will help the tubes fit snugly into the assembly. Make sure the connections are tight, as any loose fittings could lead to ink leaks or air bubbles in the ink supply.

Priming the Damper and Printhead

After all the components are installed, the final step is to prime the dampers and printhead. This process ensures that the ink flows smoothly through the system and prevents air from entering the printhead. Use a syringe to fill the dampers with ink, drawing it slowly to avoid creating air pockets.

Once the ink has filled the dampers, carefully park the printhead on the capping station. You should feel some resistance when drawing ink, which is a good indication that the printhead is primed correctly. After priming, the printer is ready for use.

At this point, your Epson ET 8550 is equipped with a nipple conversion, clear tubes, or OEM tubes depending on your setup, and waterproofed for added protection. This conversion ensures optimal performance and reduces the need for frequent maintenance.

Visit us at BCH Technologies for additional support or services, and watch the video below for a step-by-step walkthrough of this process.