1900
Effectively for a metal laser powder bed fusion system with about 100 spot size , the minimum reliable wall thickness should be 0.3-0.4 mm if no special precautions or optimization for strut manufacturing is done to enhance the manufacturability .
 material: metal; machine or equipment: laser powder bed fusion system; process parameter: spot size; engineering feature: wall thickness; material: be; manufacturing process: mm; concept or principle: optimization; machine or equipment: strut; manufacturing process: manufacturing; concept or principle: manufacturability
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:
 material: metal; machine or equipment: laser powder bed fusion system; process parameter: spot size; engineering feature: wall thickness; material: be; manufacturing process: mm; concept or principle: optimization; machine or equipment: strut; manufacturing process: manufacturing; concept or principle: manufacturability