> Most consumer printer brands, though, are designed by computer hardware or consumer electronics companies who don’t know all that much about mechanical engineering.

That was, until the rise of Darth Carly at the earliest, not the case for HP, which made a name for itself as a manufacturer of scientific and industrial equipment before expanding into computers and printers (and bringing that manufacturing expertise to those fields). HP's printer business is based on rock-solid hardware chops from decades ago.