Print data generation systems

A print data generation system to generate print data for use by an additive manufacturing system to generate a plurality of three-dimensional objects in a build chamber using plurality of powder build materials, the print data generation system comprising:

• an interface to:
• receive first model data associated with a first three-dimensional object;
• and
• receive second model data associated with a second three-dimensional object;
• and
• a processor to:
• generate, using the received first model data, first object print data to cause the additive manufacturing system to manufacture the first three-dimensional object from a first powder build material in the build chamber;
• generate partition print data to cause the additive manufacturing system to manufacture a partition formed to separate a first lower part of the build chamber, containing the first three-dimensional object, from and a first upper part of the build chamber;
• and
• generate, using the received second model data, second object print data to cause the additive manufacturing system to manufacture the second three-dimensional object from a second powder build material in the first upper part of the build chamber.

A computer readable memory encoded with print data for use by an additive manufacturing system having a build chamber to generate a first three-dimensional object from a first build material and subsequently generate a second three-dimensional object from a second build material, the print data comprising instructions to cause the additive manufacturing system to:

• manufacture a first three-dimensional object, by depositing and selectively solidifying in the build chamber at least one layer of build material, using a first set of operational parameters corresponding to the first build material;
• manufacture a three-dimensional partition, by depositing and selectively solidifying in the build chamber at least one layer of build material, the partition including at least one layer which is fully solidified such that the partition bisects the build chamber into a first lower part of the build chamber, containing the first three-dimensional object, and a first upper part of the build chamber;
• and
• manufacture a second three-dimensional object in the first upper part of the build chamber, by depositing and selectively solidifying in the build chamber at least one layer of build material, using a second set of operational parameters corresponding to the second build material;
• wherein the instructions cause the additive manufacturing system to:
• manufacture the three-dimensional partition using the first set of operational parameters;
• or
• manufacture the three-dimensional partition using the second set of operational parameters;
• or
• manufacture a first part of the three-dimensional partition using the first set of operational parameters and subsequently manufacture a second part of the three-dimensional partition using the second set of operational parameters.