Fluidic dispensing device having a stir bar

A fluidic dispensing device, comprising:

• a housing having an exterior wall and a chamber, the exterior wall having a chip mounting surface and having an opening, the chamber having an interior space having a base wall and having a port coupled in fluid communication with the opening;
• an ejection chip mounted to the chip mounting surface of the exterior wall, the ejection chip being in fluid communication with the opening;
• and
• a stir bar located in the chamber, the stir bar having a rotational axis and a plurality of paddles that radially extend away from the rotational axis, the stir bar having a magnet that interacts with an external magnetic field to drive the stir bar to rotate around the rotational axis, each of the plurality of paddles having a first portion and a second portion, wherein a first rotational velocity of a first distal extent of the first portion is higher than a second rotational velocity of a second distal extent of the second portion.

A fluidic dispensing device, comprising:

• a housing having a chamber;
• a stir bar located in the chamber;
• and
• a guide having a central axis, the guide having structure to limit radial movement and axial movement of the stir bar in the chamber relative to the central axis,
• wherein the stir bar has a plurality of paddles, wherein each of the plurality of paddles has a first tier portion and a second tier portion, the first tier portion having a first radial extent terminating at a first distal end tip and the second tier portion having a second radial extent terminating in a second distal end tip, the first radial extent being greater than the second radial extent, wherein a first rotational velocity of the first distal end tip of the first tier is higher than a second rotational velocity of the second distal end tip of the second tier portion.