Novel microdisk optical 3D structure fabrication was demonstrated in a room temperature and atmospheric condition with tens-seconds processing duration. This additive manufacturing scheme of polymeric microdisk was based on the ink-jet technique with hyperbranched polymer TZ-001. And whispering-gallery mode (WGM) lasing with a low threshold was confirmed by doping LDS798 or Rhodamine 590 dyes. The diameters both 75 μm were archived. The WGM lasing at around 800 nm wavelength by the LDS798, and at around 600 nm by the Rhodamine 590. Low lasing threshold about 2∼3 μJ/mm2 were confirmed. And shift of peak wavelength was observed on the Rhodamine590:TZ-001 disk.