Remove cap from Lexmark cartridge and install Dell cap that you removed earlier on body of Lexmark cartridge. Expect to get some ink on your hands.

Glue Dell cap on Lexmark body using super glue, airplane glue or a hot glue gun. Hot glue is probably better because it will be easier to remove cap to re-use later.

You should now be able to use your new Lexmark cartridge in your Dell printer.

The second method is to modify printer. Some people may get a little queasy with this but both methods work. If you have a problem with this method just use cap method.

In your printer there is a "half-round" plastic protrusion that prevents you from using a Lexmark cartridge. By simply removing piece of plastic you will be able to insert Lexmark cartridge into your Dell printer.

Start by purchasing your Lexmark cartridge(s). Insert Lexmark cartridge in your printer. It WILL NOT go in all way, don't force it. Carefully peer into printer, you may need a flashlight, and take notice where plastic protrusion is preventing Lexmark cartridge to go back in further. I am told it is fairly evident and you should have no trouble seeing it. It is a "half-round" protrusion at top rear of cartridge.

Once you see plastic protrusion you can either remove screws that hold it in place or remove it with a pare of pliers or wire cutters. I can't take responsibility if you kill your printer but if you are careful you shouldn't have any problems.

Do same with color cartridge and your Lexmark cartridges should now fit in your Dell printer.

Epson and Canon have lowest operating temperatures whereas HP and Lexmark have highest. These print head fire at many thousands of degrees Fahrenheit. If you are using an ink that is not designed to withstand temperatures of this magnitude then you are likely to run into problems.

Then you have standard grade vs. hi grade black ink. The standard grade may print a lot grayer than hi grade which we call "Ultra Black". This is mostly prominent in pigmented black inks. If your black print looks a little on gray side you might want to upgrade to Ultra Black ink.

Also there is photo black. Photo black inks are always dye based since pigmented inks do not mix well with dye based colors. These inks are formulated to "get along" with their color counterparts for best results in photos.

So now you are all black ink experts. After reading this is anybody motivated to buy one of those universal kits? I shutter to think what their budget for lawsuits is. :-)