A system for degassing ink in an ink ejection device comprising: an ink chamber having an associated firing element and nozzle ; an ink supply slot in fluid communication with the ink chamber ; a controller to control drop ejections through the nozzle by activating the firing element ; a degassing module executable on the controller to generate a first nucleation site within the ink chamber through repeated, sub-turn-on-energy activations of the firing element ; and a first bubble-impeding structure between the ink chamber and the ink supply slot to prevent a first air bubble from venting into the ink supply slot , wherein the first bubble-impeding structure provides a clearance that ranges between approximately 1 micron and approximately 10 microns, the system further comprising: a recirculation channel having first and second ends coupled with the ink supply slot ; a pump element located toward the first end of the channel ; the ink chamber located toward the second end of the channel; a second bubble-impeding structure between the pump element and the ink supply slot to prevent a second air bubble from venting into the ink supply slot , wherein the degassing module is configured to generate a second nucleation site through repeated, turn-on-energy activations of the pump element , wherein the second bubble-impeding structure between the pump element and the ink supply slot is to prevent the second air bubble, formed on the second nucleation site, from venting into the ink supply slot . an ink chamber having an associated firing element and nozzle ; an ink supply slot in fluid communication with the ink chamber ; a controller to control drop ejections through the nozzle by activating the firing element ; a degassing module executable on the controller to generate a first nucleation site within the ink chamber through repeated, sub-turn-on-energy activations of the firing element ; and a first bubble-impeding structure between the ink chamber and the ink supply slot to prevent a first air bubble from venting into the ink supply slot , wherein the first bubble-impeding structure provides a clearance that ranges between approximately 1 micron and approximately 10 microns, the system further comprising: a recirculation channel having first and second ends coupled with the ink supply slot ; a pump element located toward the first end of the channel ; the ink chamber located toward the second end of the channel; a second bubble-impeding structure between the pump element and the ink supply slot to prevent a second air bubble from venting into the ink supply slot , wherein the degassing module is configured to generate a second nucleation site through repeated, turn-on-energy activations of the pump element , wherein the second bubble-impeding structure between the pump element and the ink supply slot is to prevent the second air bubble, formed on the second nucleation site, from venting into the ink supply slot . a recirculation channel having first and second ends coupled with the ink supply slot ; a pump element located toward the first end of the channel ; the ink chamber located toward the second end of the channel; a second bubble-impeding structure between the pump element and the ink supply slot to prevent a second air bubble from venting into the ink supply slot , wherein the degassing module is configured to generate a second nucleation site through repeated, turn-on-energy activations of the pump element , wherein the second bubble-impeding structure between the pump element and the ink supply slot is to prevent the second air bubble, formed on the second nucleation site, from venting into the ink supply slot . <EOS>