Output device for uniformly mixed liquid and method for making and using the same

A vented output device for uniformly mixed liquid comprising:

• a barrel having an open head end and a closed end, an interior of the barrel defining a reservoir for containing liquid;
• a vent insert positioned with the open head end of the barrel, an interior of the vent insert in fluid flow communication with the reservoir and defining a chamber for containing liquid;
• a nib positioned within a front open end of the vent insert and in fluid flow communication with the chamber, wherein a tip of the nib extends outward from the barrel;
• at least one vent channel extending from a first vent opening in fluid flow communication with an exterior of the device and a second vent opening in fluid flow communication with the chamber;
• wherein the vent insert is hollow extending from the open front end to a rear end defined by a circular base, wherein the circular base is slightly smaller in diameter than the barrel such that gaps are formed between the walls of the barrel and the base, and wherein an outer surface of a main body of the vent insert is in tight abutting contact with an interior surface of the barrel, and wherein the vent channel comprises an elongated closed channel extending from the first vent opening to the second vent opening between an outer surface of the main body and an interior surface of the barrel.