3D Printing
3D printing introduction
3D打印，即快速成型技术，以数字模型文件为基础，运用可粘合材料进行物体构造的技术。
3D printing, or rapid prototyping, is a technology that uses digital model files as the basis for constructing objects using bondable materials.
3D打印存在着不同的技术和类型，可以使用不同的材料，常用的包括尼龙、石膏、合金、橡胶、PLA等。
There are different technologies and types of 3D printing, and different materials can be used, including nylon, gypsum, alloy, rubber, PLA, etc.
实现3D打印，通过计算机软件，首先进行建模，生产数字模型文件，再将三维模型进行逐层分区生成截面，即切片，打印机设备根据文件内容进行逐层打印，层层堆叠形成立体模型。
To achieve 3D printing, through computer software, first modeling, production of digital model files, and then the three-dimensional model for layer-by-layer partitioning to generate cross-sections, that is, slices, printer equipment according to the contents of the file for layer-by-layer printing, layer by layer stacked to form a three-dimensional model.
Process demonstration
我们在 Thingiverse 上搜索了模型。链接如下：https://www.thingiverse.com/thing:3674315
We searched for models on thingiverse.
3D打印的源文件文件共享，包括一个stl文件
Source files for 3D printing file sharing, including an STL file
3D打印模型的文件类型为stl格式。通过切面软件将模型处理为3D打印可以加工的数据（在该步骤需要勾选支撑，便于对空心的关节部位进行打印）。3D打印机首先要打印平台进行调平，然后对喷头进行预热，最后进行打印。
The file type of 3D printing model is STL format. The model is processed into 3D printable data through the section software (support needs to be checked in this step to print the hollow joint). The 3D printer first needs to level the printing platform, then preheat the nozzle, and finally print.
如图所示，该模型的每个关节环环相扣，又保留一定的空隙，两个关节的半径分别为2.5mm 与 1.4mm，这使得打印出来后的蛇形3D模型的各个关节可以相对自由地活动。
As shown in the figure, each joint of the model is linked, and a certain gap is reserved. The radii of the two joints are 2.5mm and 1.4mm respectively, so that each joint of the printed snake 3D model can move relatively freely.
掰动打印好的三维模型的关节处 ，使多余的材料断裂，让三维模型的每个关节可以自由活动。
Break the joints of the printed 3D model to break the excess material and allow each joint of the 3D model to move freely.
