According to one aspect, there is provided a method of automatically creating sacrificial parts to be printed in the three-dimensional printer. The method comprises obtaining object model data relating to a three-dimensional object to be printed in a build chamber by a three-dimensional printer. The method determines whether the object will likely be deformed during a curing process of contents of the build chamber, wherein the curing process comprises heating of the contents of the build chamber and generating a gas flow. If the determination is affirmative, the method includes generating updated object model data including additional object to be printed in proximity to the object, the additional object to prevent deformation of the object due to the gas flow applied during the curing process.