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The 672C and 612C use the HP 29 and 15 black carts, respectively. I successfully refilled those from the bottom several times. It's important to refill before the ink runs completely out, or you can get air blocks and clogged nozzles. They can be cleaned, but it's a bother.

I use a PSC 2110, which has the 56/57/58 family of carts. I've had it for almost a year and a half, and I have yet to use a cart other than the two that came with it. I tried refilling carts for the Deskjet 672C and 612C a few times, and while I had good luck with the black, the tricolor cart...