Refilling a used ink cartridge

A method for refilling a used ink cartridge, comprising:

• introducing ink into an ink holding chamber in the cartridge;
• simultaneously with introducing ink into the chamber, monitoring the level of ink in the chamber;
• and ending the introduction of ink into the chamber when the level of ink in the chamber reaches a desired level;
• wherein:
• introducing ink into an ink holding chamber in the cartridge comprises inserting a needle into the chamber and introducing ink into the ink holding chamber through the needle;
• and monitoring the level of ink in the chamber comprises monitoring the level of ink in the chamber through the needle.

A method for refilling a used ink cartridge, comprising:

• determining a quantity of ink remaining in an ink holding chamber in the cartridge;
• determining a desired quantity of ink to refill the chamber based on a difference between a capacity of the chamber and the quantity of ink remaining in the chamber;
• introducing a first quantity of ink into the chamber at a first pressure;
• and then
• introducing a second quantity of ink into the chamber at a second pressure lower than the first pressure until the desired quantity of ink has been introduced into the chamber.

A method for refilling a used ink cartridge, comprising:

• introducing a first quantity of ink into the chamber at a first pressure;
• then
• introducing a second quantity of ink into the chamber at a second pressure lower than the first pressure;
• simultaneously with introducing the second quantity of ink into the chamber, monitoring the level of ink in the chamber;
• and
• ending the introduction of ink into the chamber when the level of ink in the chamber reaches a desired level.

A method for refilling a used ink cartridge, comprising:

• weighing the used cartridge;
• determining a difference between the weight of the used cartridge and a weight of a new cartridge;
• determining a desired quantity of ink to refill the chamber based on the difference between the weight of the used cartridge and the weight of a new cartridge;
• introducing a first quantity of ink into the chamber at a first pressure;
• and then
• introducing a second quantity of ink into the chamber at a second pressure lower than the first pressure until the desired quantity of ink has been introduced into the chamber.

A method for refilling a used ink cartridge, comprising:

• determining a quantity of ink remaining in an ink holding chamber in the cartridge;
• determining a desired quantity of ink to refill the chamber based on a difference between a capacity of the chamber and the quantity of ink remaining in the chamber;
• and
• refilling the chamber with the desired quantity of ink, wherein determining a quantity of ink remaining in an ink holding chamber in the cartridge comprises measuring the quantity of ink remaining in the chamber.