Canon Knowledge Base - Replace ink cartridge(s) iP1700 / iP1800
Canon Pixma iP1800 Photo Printer - Inkjet, 4800 x 1200 dpi (Color), 600 x 600 dpi (Black), Up to 20 PPM (Black), USB, Refurbished, Open Box at TigerDirect.com
Canon Knowledge Base - Setting paper thickness lever iP1800
How do I pull a pen out of a Canon Pixma iP1800 printer without its owner knowing? (details in my comment) : r/fixit