这是个难以控制，高精度要求的工序，同时在原材料上的微小缺陷，或者没有将不同的层排列在一条直线上，这都会导致一个批次中的20%或者更多的产品成为废料。
This is a fractious, finicky process and tiny defects in the materials, or failures in the alignment of the different layers, can result in 20% or more of a batch being scrapped.
现场是否有可追溯体系，包括通过质量控制数据和批次记录，由最终产品追溯到所有的原材料和供应商？
A traceability system is in place, including tracing back from the final product through quality control data and batch records to the raw materials used and the suppliers?
生产批次的一个重要元素是库存清单。这份清单表明了最终成品和原材料，中间部件和相关组件之间的关系。
An important element of production orders is the bill of materials. This list shows the relationship between end products and raw materials, intermediate parts, components, etc.
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