Ink cost efficiency is one of primary advantages of the Epson L550.
The box attached to its right side is where the printer draws the ink from.
It works differently from ink cartridges, and most importantly it is cheaper than ink cartridges.

It measures 226 mm tall, 474 mm wide, and 377 mm deep.
The ink box also contributes to the width of the Epson L550.
Six Ink Bottles
The Epson L550 is a color printer that uses four colors.

It ships with three black ink bottles and three color ink bottles.
Each bottle contains 70ml of dye-based ink.
It makes the printhead more durable because it doesnt use heat to eject droplets of ink.

Since the printhead can last longer, you dont have to worry about replacing it soon.
Ink is also needed by the printer to clean its print head.