Resin powder having pillar shape and specific circularity for solid freeform fabrication, device for solid freeform fabrication object, and method of manufacturing solid freeform fabrication object

A resin powder for solid freeform fabrication comprising:

• a particle having a pillar-like form,
• wherein a ratio of a height of the particle to a diameter or a long side of a bottom of the particle is 0.5 to 2.0,
• wherein the particle has a 50 percent cumulative volume particle diameter of from 5 to 200 μm,
• wherein a ratio (Mv/Mn) of a volume average particle diameter (Mv) to a number average particle diameter (Mn) of the particle is 2.00 or less, and
• wherein the resin powder has an average circularity of 0.83 or greater in a range in which the resin powder has a particle diameter of from 0.5 to 200 μm.