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Several building rules have been proposed to improve the strength and accuracy of the FDM printed parts , such as build parts to ensure tensile loads are carried axially along printed directions , deal with the stress concentration at corners , use negative air gap to increase both strength and stiffness , consider that small bead width leads to extra printing time and better surface quality , be aware the part accuracy affected by the build orientation , and realize that tensile loaded area tends to fail easier than compression loaded area .
 machanical property: strength; process characterization: accuracy; manufacturing process: FDM; material: as; process characterization: tensile loads; process characterization: stress concentration; machanical property: strength; machanical property: stiffness; process characterization: bead width; process parameter: surface quality; material: be; process characterization: accuracy; process parameter: build orientation; machanical property: tensile; process parameter: area; machanical property: compression; process parameter: area
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 machanical property: strength; process characterization: accuracy; manufacturing process: FDM; material: as; process characterization: tensile loads; process characterization: stress concentration; machanical property: strength; machanical property: stiffness; process characterization: bead width; process parameter: surface quality; material: be; process characterization: accuracy; process parameter: build orientation; machanical property: tensile; process parameter: area; machanical property: compression; process parameter: area