A method comprising: defining a test part (200; 260; 330; 360; 400; 440; 500; 540) having a first feature (202; 264; 334; 364; 404; 444; 504; 544) that is a bulk type; controlling an additive manufacturing machine to print multiple copies of the test part (200; 260; 330; 360; 400; 440; 500; 540), wherein the AM machine operates according to a plurality of printing parameters, wherein the controlling includes: for each of the multiple copies, generating a set of values for the plurality of printing parameters and controlling the AM machine to print each of the multiple copies according to the respective set of values for the plurality of printing parameters; obtaining a computed tomography image of each of the copies of the test part (200; 260; 330; 360; 400; 440; 500; 540); analyzing the CT images to identify a selected set of values for the plurality of printing parameters, wherein the analyzing includes: identifying a portion of the CT image related to the first feature (202; 264; 334; 364; 404; 444; 504; 544) and assessing density of the first feature (202; 264; 334; 364; 404; 444; 504; 544) based on a grayscale value of the portion of the CT image; and controlling the AM machine to print production parts according to the selected set of values for the plurality of printing parameters, characterized in that the test part has a plurality of features of a plurality of feature types, wherein the plurality of features includes the first feature and a plurality of further features including a vertical fin type, a hole type, and a rod type, wherein the step of analyzing the CT images is carried out for each of the plurality of feature types, wherein the step of assessing density of the first feature (202; 264; 334; 364; 404; 444; 504; 544) is based on an average grayscale value of the portion of the CT image, and wherein the step of controlling the AM machine is carried out according to, for each feature type of the production parts, the selected set of values for the plurality of printing parameters. defining a test part (200; 260; 330; 360; 400; 440; 500; 540) having a first feature (202; 264; 334; 364; 404; 444; 504; 544) that is a bulk type; controlling an additive manufacturing machine to print multiple copies of the test part (200; 260; 330; 360; 400; 440; 500; 540), wherein the AM machine operates according to a plurality of printing parameters, wherein the controlling includes: for each of the multiple copies, generating a set of values for the plurality of printing parameters and controlling the AM machine to print each of the multiple copies according to the respective set of values for the plurality of printing parameters; for each of the multiple copies, generating a set of values for the plurality of printing parameters and controlling the AM machine to print each of the multiple copies according to the respective set of values for the plurality of printing parameters; obtaining a computed tomography image of each of the copies of the test part (200; 260; 330; 360; 400; 440; 500; 540); analyzing the CT images to identify a selected set of values for the plurality of printing parameters, wherein the analyzing includes: identifying a portion of the CT image related to the first feature (202; 264; 334; 364; 404; 444; 504; 544) and assessing density of the first feature (202; 264; 334; 364; 404; 444; 504; 544) based on a grayscale value of the portion of the CT image; and identifying a portion of the CT image related to the first feature (202; 264; 334; 364; 404; 444; 504; 544) and assessing density of the first feature (202; 264; 334; 364; 404; 444; 504; 544) based on a grayscale value of the portion of the CT image; and controlling the AM machine to print production parts according to the selected set of values for the plurality of printing parameters, characterized in that the test part has a plurality of features of a plurality of feature types, wherein the plurality of features includes the first feature and a plurality of further features including a vertical fin type, a hole type, and a rod type, wherein the step of analyzing the CT images is carried out for each of the plurality of feature types, wherein the step of assessing density of the first feature (202; 264; 334; 364; 404; 444; 504; 544) is based on an average grayscale value of the portion of the CT image, and wherein the step of controlling the AM machine is carried out according to, for each feature type of the production parts, the selected set of values for the plurality of printing parameters.