Inkjet forming method

An inkjet forming method, which is a three-dimensional object forming method for forming a three-dimensional object in which a target object and a transparent portion are integrally formed by vertically stacking a plurality of forming layers in a vertical direction, the inkjet forming method comprising:

• providing an inkjet printer;
• forming each of the forming layers to include a central region by ejecting droplets of at least one non-transparent ink via the inkjet printer;
• forming each of the forming layers to include an end region with respect to the central region by ejecting droplets of a transparent ink via the inkjet printer;
• and
• stacking the forming layers in the vertical direction such that adjacently stacked forming layers delineate a gradient and such that a boundary outer contour of the lower forming layer of the adjacently stacked forming layers projects more outward in a horizontal direction than a boundary outer contour of the upper forming layer of the adjacently stacked forming layers;
• wherein the end regions of the vertically stacked forming layers formed the transparent portion,
• wherein the central regions of the vertically stacked forming layers formed the target object,
• wherein the target object is visually recognized through the transparent portion;
• wherein the gradient is defined by dividing a distance in the vertical direction between the upper surfaces of the adjacently stacked forming layers and a distance in the horizontal direction by which the boundary outer contour of the lower forming layer projects beyond the boundary outer contour of the upper forming layer of the adjacently stacked forming layers, and
• wherein the value of the gradient is set to be equal to or less than 100.