Abstract: A method for maintaining a fluidic dispensing device includes providing a fluidic dispensing device having a fluid reservoir containing fluid, the fluid reservoir being defined in part by a base wall, and having a stir bar located in the fluid reservoir adjacent to the base wall, and having a fluid ejection chip having a fluid ejection direction; positioning the fluidic dispensing device at a predetermined orientation, wherein the fluid ejection direction is oriented in a range of upward vertical, plus or minus 90 degrees; and rotating the stir bar in a first rotational direction starting with a first rotational speed and increasing rotational velocity from the first rotational speed to a second rotational speed.

Abstract: A method for maintaining a fluidic dispensing device includes providing a fluidic dispensing device having a fluid reservoir containing fluid, the fluid reservoir being defined in part by a base wall, and having a stir bar located in the fluid reservoir adjacent to the base wall, and having a fluid ejection chip having a fluid ejection direction; positioning the fluidic dispensing device at a predetermined orientation, wherein the fluid ejection direction is oriented in a range of upward vertical, plus or minus 90 degrees; and rotating the stir bar in a first rotational direction starting with a first rotational speed and increasing rotational velocity from the first rotational speed to a second rotational speed.

Abstract: A fluidic dispensing device includes a housing having an exterior wall and a chamber. The exterior wall has a chip mounting surface and an opening. The chamber defines an interior space having a base wall and a port coupled in fluid communication with the opening. An ejection chip is in fluid communication with the opening. A stir bar is located in the chamber. The stir bar has a rotational axis and a plurality of paddles that radially extend away from the rotational axis. Each of the plurality of paddles has an axial extent having a first tier portion and a second tier portion. The first tier portion has a first radial extent and the second tier portion has a second radial extent, wherein the first radial extent is greater than the second radial extent.