This has been one of the greatest yet super on the down low hack. Costco wants you to buy those new cartridges so you have to know they do it to get it done. Ain't no big signs at my Costco announcing this service.
Then they came out with ink cartridges for fountain pens. When the cartridge was empty, I used the previous ink bottle to refill the cartridge by squeezing the cartridge, sticking it in the ink bottle, and letting go so it would suck up ink.
Pluma – Color Pen for Sketching by Yeban Shin - The PLUM concept is a pen that features a CMYK ink cartridge and is mixed with microfluidic technology (commonly used in medicine industry) to create a specific color that is desired. As you sketch, your drawing gets auto saved to a micro SD chip in the pen’s cap. | Yanko Design