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2. Ink cartridge - Wikipedia

   en.wikipedia.org/wiki/Ink_cartridge

   Epson's EcoTank printers offer a refillable ink tank system, which can potentially lower the cost per page compared to traditional ink cartridges, with a higher cost-of-entry. [12] This operates similar to continuous ink system printers, including notifying the user's PC to ensure the tanks do not run dry, which can damage the print head.

3. Etching - Wikipedia

   en.wikipedia.org/wiki/Etching

   The remaining ground is then cleaned off the plate. For first and renewed uses the plate is inked in any chosen non-corrosive ink all over and the surface ink drained and wiped clean, leaving ink in the etched forms. The plate is then put through a high-pressure printing press together with a sheet of paper (often moistened to soften it). [6]

4. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   Pencils with sub-millimeter leads can usually hold multiple leads at the same time, reducing the frequency of refills. One exception was the Pentel 350 E, possibly Pentel's first mechanical pencil, [14] which could only hold a single stick of 0.5 mm lead. Refill leads can be bought in small tubes and inserted into the barrel as needed.