您需要考虑许多因素，例如模型大小和模型用户的数量。
You need to consider factors such as model sizes and the number of modeling users. These factors will determine how long it will take to complete these tasks.
我做了一个和原物一样大小的硬纸板模型。
3D 打印机已经被用来制作实物大小的汽车零件模型和人造身体部位，例如耳朵。
3D printers are already used to make life-size models of car parts, and man-made body parts, such as ears.
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