IN a bubble jet.
IN an InkJet are you sure the same mechanisms are utilized?

The original inkjet printer -- which dates back more than 40 years --
mechanically squirted a stream of droplets at the paper, deflecting the
unused droplets electrostatically for recycling. The thermal inkjet was
based on the discovery that heating the end of a tube containing ink would
boil the ink and cause a drop to squirt out. This "on-demand" system made
cheap inkjet printers possible.