Three-dimensional shaped article manufacturing method and data processing device

A three-dimensional shaped article manufacturing method comprising:

• a first shaping step of forming a first layer in contact with a stage provided with a recess portion by moving a discharge unit while discharging a first shaping material from the discharge unit toward the stage;
• and
• a second shaping step of stacking a second layer on the first layer by moving the discharge unit while discharging a second shaping material from the discharge unit toward the first layer, wherein
• the first shaping step includes
• acquiring first data including a first route that is a route on which the discharge unit moves while discharging the first shaping material,
• acquiring stage data indicating a position of the recess portion in the stage,
• a first data changing step of generating, based on the first data and the stage data, first changed data including a first changed route obtained by changing the first route, that is, generating the first changed data based on the first data such that an overlap degree between the first changed route and the recess portion is larger than an overlap degree between the first route and the recess portion, and
• forming the first layer according to the first changed data.