 Hi, this is Kevin from BCH. Today we're going to make a refillable cartridge from HP integrated cartridge that has a square shape. The integrated cartridges are the cartridges that has a printhead on the bottom and an electronic ribbon on the side. HP makes two kinds of desktop integrated cartridges. One is a short rectangle, actually a cut square. I mean, it's not a perfect square, but it's more squarely than a very long rectangle one. Most of the integrated cartridges are square ones, such as 21, 56, 61, 62, 63. Most of the time, they are square. This is what looks inside HP cartridge. If we have a starter or regular cartridge, there is an interior wall to hold a tiny sponge. This will limit how much ink we can refill. The XL cartridge doesn't have this wall and has a larger sponge. However, the sponge takes about half of the available space inside the cartridge. In this video, we're going to remove the wall, the sponge, and glue a special cover with a pressure regulator, and thus make a sponge-less refillable cartridge. Let's go over what we need. We need some sandpaper and 100 grade or 150 grade. Personally, I like 150 grade, but because I like so much, we just run out of it. And we need a heavy-duty utility knife. And do not use those flimsy office knives and get a really sturdy utility knife. And then we'll need some rubber bands. And two is enough. And after that, we need super glue. Do not use those foam superglues, such as Gorilla White. If you decide to use Gorilla Glue, use the Gorilla Clear or Gorilla Brown. When picking a glue, we'll make sure it's waterproof. Then we'll check it's tech-free and the cure time. For example, the Gorilla Clear glue is foam-free, 2 hours tech-free, and 24 hours cure. Therefore, we probably will leave it at least 12 hours before using the product. And if we use a superglue, superglue normally is 12 seconds set time. And we'll leave it at least 12 hours for the cure. And lastly, we need a long-nose plier. The special cover can be found at bchtechnologies.com. I'll go to ModKit, and you want to select for HP. And then you can find this ModKit for making spongeless cartridge. And HP square means it's a squared kind of HP. There are two parts of the cartridge that need to be protected. One is the pre-knit on the bottom of a cartridge, which needs to be protected from dirt and debris. Another one is the electronic ribbon, which needs to be protected from the overflow of a superglue. We can use a piece of surround wrap or clear tape to do the job. Caution, if we use a piece of clear tape, like what we're doing now, it'll be important to apply the non-sticky side towards the printhead. Otherwise, if the printhead comes in contact with the glue on the tape, the printhead may be damaged permanently. So we put the first piece of tape with the glue set towards us on the base. Then after that, we'll use two more pieces of clear tape to secure the protective piece to the cartridge body. As we wrap one piece around the bottom and one piece around the side, we'll next use a utility knife to cut the top. This step involves a sharp knife, so we must be careful. Starting from the edge, we use the edge as a pivot and push the knife up and down. Once the edge is open, we'll work on the other edges. Combine the cutting with a little bit of prying. Once all the edges are loosened, the cap can be taken off and exposed to sponge inside. Important, write down the color sequence of the cartridge. HP makes the same cartridge with the different color arrangements now. And your cover's color-coded plug may be different than the cartridge. We need to match the cover with the cartridge. We won't take the sponge out yet because we need the sponge to protect the printhead from dirt and debris from this step. We'll use a 150-grade sandpaper to sand the top of the cartridge evenly and smoothly. We'll then use a knife to remove the high-end debris because we have to glue a top that's airtight. So you have to make sure that you sand everything evenly. And here you can see there are still some shining part on the right and the left. So the cartridge is now sanded evenly. This is what the final result should look like. You may ask what to do with those internal walls. So we use a long-nose plier to remove those four walls inside. We don't have to remove the walls completely. It'll work as long as the ink can flow freely inside the chamber. Also, be careful to not break or penetrate the filter by the square filter on the bottom. We'll now wipe or blow out the debris on the top of the cartridge again. After removing the sponge, we suggest cleaning the inside of the cartridge. We can use compressed air or distilled water or tap water. If we see dried ink on the filter, it is a good time to put it under running water and watch it until the filter is clean. After the top is dry, we'll try to fit the cover on the cartridge. We'll do it again and again until we can insert the cover in one take. Remember, you only got one shot to make it this perfect, and it has to be airtight. So practice and practice. Practice until you can do this, even your sleepwalking. Now is the crunch time. Look at the rubber band handy, and then we're going to attach the top of the superglue. Because we want to seal each compartment airtight, and the inside dividing walls, which are dividing the three colors, those walls are really thin. So we can add a little bit of a superglue to the inner grooves of the cover. So we add some horizontally and some little bit more vertically, form a T shape. We'll apply a generous amount of superglue on the rim of the cartridge. Then the thin dividing wall between the compartments. Make sure you wear eye protection while doing this. Hold your breath while doing this. Perfect. Wrap it tight as you can. Then we'll leave the cartridge to cure, according to the glue curing time. For superglue, we're going to cure about two or three hours. After double checking the color arrangements, we'll add ink until each compartment is full. Then we'll insert plugs to seal the top. I want to talk a little bit about unclogging. After we put the cartridge back to the printer, if the printer is working, but the printout is blank or has straps, then the printhead is clogged. Traditionally, we can put the cartridge on our priming clip, like this one. And then we suck ink from the bottom. We should have seen more inks coming out. So this cartridge is blocked really, really bad. The second way of unclogging is we have a piece of white paper towel. Then we wrap around the cartridge with a vacuum cleaner. And we'll use a force vacuum cleaner to suck it from the bottom. For spongeless cartridges, we now have a new way of unclogging, because all the color chambers are sealed airtight. If we did right, we can blow air into the air hole and push the ink out from the top. This method is easy and effective for minor clocks. However, for the clocks like this big, which the printhead is clogged rock solid, the air pressure is not going to work, because it will either create an ink backflow or maybe it will blow out the refill plug. Therefore, only use this method if you have a minor clog. Also, you might want to release the pressure inside the cartridge after blowing air by remove and reinsert the refill plug. If we have a clog this big, we should fill up both with a quarter inch or half inch of water and soak the cartridge for 20 minutes or to an hour. And then use the vacuum method or use the priming clip to suck it out. And then if the result is not desirable, just repeat it. So you get a major clogs removed. Then you can fine tune it with the air blowing technique. This is what it should look like. So we blow air to the air hole. And then we can see the ink coming out from the bottom. We give a few seconds. Then we remove and reinsert the refill plug. So the excessive air can be released. We'll clean the electronic ribbon and then insert the cartridge into the printer. And then do a printhead cleaning using the printer's function. The refill cartridge will not show the new ink level. The printer should work until the printer thinks the ink is depleted. We'll simply click the OK button to acknowledge the ink depletion and keep using the printer. The printer should work forever now. We'll pay attention to the printout. If a color is fading, we'll take the cartridge out and add more ink. If the cartridge is printing in stripes, we'll take the cartridge out and unclog it using our three methods that we showed. For all the warning messages like low on ink or ink depletion, and just click OK to bypass it, we just made the HP cartridge great again. I hope you enjoyed this video. Visit us at bchtechnologies.com or locally at Greensboro, North Carolina. Thank you for watching. Enjoy printing. Cheers.