A printer, comprising: a housing comprising a housing body with an accommodation chamber defined therein, a reel disposed between two inner rear side walls of said accommodation chamber to support a paper roll of a sheet of paper, a front panel located at a front side of said housing body and a paper exit formed in said front panel; a printing mechanism positioned in said accommodation chamber, said printing mechanism comprising a printing head for printing an ink on said sheet of paper of said paper roll, a paper cutter controlled to cut said sheet of paper of said paper roll, and a paper path defined between said printing head and said paper cutter for the passing of a leading end of said sheet of paper of said paper roll; and a paper dispensing mechanism positioned in said accommodation chamber, said paper dispensing mechanism comprising a drive module and a paper dispensing roller set drivable by said drive module to carry said sheet of paper of said paper roll toward said paper exit, wherein said paper dispensing roller set comprising two rollers made of a flexible and elastic material and pressed against each other, the distance between the center of said two rollers being less than the combination of the radius of said two rollers, the two rollers being squeezed to be clamped on the two opposite surfaces of the sheet of paper, a paper-dispensing paper path being defined between the two rollers and disposed in communication with said paper path of the printing mechanism for the passing of said sheet of paper of said paper roll, said paper-dispensing paper path having an inlet defined in a rear end thereof and connected to said paper path of said printing mechanism and an outlet defined in an opposing front end thereof and connected to said paper exit of said front panel, the paper dispensing roller set 32 being disposed in front of the printing mechanism 2; wherein said printing head of said printing mechanism comprises a printing wheel disposed adjacent to one lateral side of said paper path for printing an ink on a surface of said sheet of paper of said paper roll; said paper cutter comprises a cutter blade disposed adjacent to an opposite lateral side of said paper path for cutting said sheet of paper of said paper roll. a housing comprising a housing body with an accommodation chamber defined therein, a reel disposed between two inner rear side walls of said accommodation chamber to support a paper roll of a sheet of paper, a front panel located at a front side of said housing body and a paper exit formed in said front panel; a printing mechanism positioned in said accommodation chamber, said printing mechanism comprising a printing head for printing an ink on said sheet of paper of said paper roll, a paper cutter controlled to cut said sheet of paper of said paper roll, and a paper path defined between said printing head and said paper cutter for the passing of a leading end of said sheet of paper of said paper roll; and a paper dispensing mechanism positioned in said accommodation chamber, said paper dispensing mechanism comprising a drive module and a paper dispensing roller set drivable by said drive module to carry said sheet of paper of said paper roll toward said paper exit, wherein said paper dispensing roller set comprising two rollers made of a flexible and elastic material and pressed against each other, the distance between the center of said two rollers being less than the combination of the radius of said two rollers, the two rollers being squeezed to be clamped on the two opposite surfaces of the sheet of paper, a paper-dispensing paper path being defined between the two rollers and disposed in communication with said paper path of the printing mechanism for the passing of said sheet of paper of said paper roll, said paper-dispensing paper path having an inlet defined in a rear end thereof and connected to said paper path of said printing mechanism and an outlet defined in an opposing front end thereof and connected to said paper exit of said front panel, the paper dispensing roller set 32 being disposed in front of the printing mechanism 2; wherein said printing head of said printing mechanism comprises a printing wheel disposed adjacent to one lateral side of said paper path for printing an ink on a surface of said sheet of paper of said paper roll; said paper cutter comprises a cutter blade disposed adjacent to an opposite lateral side of said paper path for cutting said sheet of paper of said paper roll.