Portable printer

A portable printer comprising:

• a main body in a portable form which is capable of accommodating a cartridge having a nozzle configured to deliver a printing material to a target having a soft or hard surface;
• a seating part which is provided to be exposed to an outside from a lower portion of the main body to face the surface of the target and at least partially surrounds the nozzle;
• a roller provided respectively at the front and rear of the nozzle at the lower portion of the main body with respect to a direction in which the main body moves along the surface of the target to deliver the printing material to the target;
• and
• a printing adjustment unit configured to adjust a height difference between the nozzle and the roller to adjust a height difference between the nozzle and the surface of the target,
• wherein the roller is provided in the seating part and moves integrally with the seating part by the printing adjustment unit, and
• wherein the printing adjustment unit comprises:
• an elastic member which is provided between the main body and the seating part and has an elastic force to maintain the seating part in a restoration position that is one of a retracted position and a protruding position with respect to the main body;
• and
• an operating member which is provided in the seating part and places the seating part in a change position of the other one of the retracted position and the protruding position with respect to the main body by external manipulation.