Reusable cartridge systems, devices, and methods

A formulation delivery device, comprising:

• a reusable handle configured to receive a formulation cartridge storing a first and a second formulation packet, wherein the reusable handle is generally cylindrical with an opening at a rear end;
• a formulation dispensing assembly disposed in the reusable handle at a forward end, the formulation dispensing assembly comprising:
• a first fluid conduit configured to fluidically connect with the first formulation packet;
• a second fluid conduit configured to fluidically connect with the second formulation packet, wherein the first and the second fluid conduits are sized relative to each other to create a predetermined component ratio of the first formulation to the second formulation;
• a pump fluidically connected to the first and the second fluid conduit;
• a nozzle assembly fluidically connected to the first and the second fluid conduit and the pump;
• a turbulent mixing chamber positioned adjacent to the nozzle assembly, the turbulent mixing chamber includes at least one helical mixer having a total length between 20 mm to 40 mm and an outside diameter between 2 mm to 5 mm;
• and
• a controller disposed in the reusable handle, wherein the controller comprises logic, which when executed, causes the pump to pump the first and the second formulation through the nozzle assembly at a plurality of flow rates, and
• the formulation cartridge is partially inserted within the rear opening of the reusable handle, the formulation cartridge includes a rear handle portion and a forward refill unit containing the first and second formulation packets, wherein the refill unit is contained with the reusable handle and the rear handle portion extending from the rear of the reusable handle and opposite from the formulation dispensing assembly.