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[3D打印] 3D打印建模注意事项有哪些?

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发表于 2016-1-7 11:41:03 | 显示全部楼层 |阅读模式
        3D模型的获取有两种方式,一种是借助3D扫描仪,另外一种就是利用CAD等建模软件进行3D模型设计。今天,小编为大家分享下在3D打印建模过程中需要注意的问题,希望能对广大的建模人员带来一点点帮助。
231556578807.jpg
      请看下面:
1、物体模型必须为封闭的也可以通俗的说是“不漏水的”(Watertight)。
有时要检查出你的模型是否存在这样的问题有些困难。如果你不能够发现此问题,可以借助一些软件,比如3ds Max的STL检测(STL Check)功能,Meshmixer的自动检测边界功能。一些模型修复软件当然是能做的,比如Magics,Netfabb等。


2、物体需要厚度CG行业的模型通常都是以面片的形式存在的,但是现实中的模型不存零厚度,我们一定要给模型增加厚度。


3、物体模型必须为流形(manifold) 。
简单来看,如果一个网格数据中存在多个面共享一条边,那么它就是非流形的(non-manifold)。


4、正确的法线方向。
模型中所有的面法线需要指向一个正确的方向。如果你的模型中包含了错误的法线方向,我们的打印机就不能够判断出是模型的内部还是外部。


5、物体模型的最大尺寸物体模型最大尺寸是根据3D打印机可打印的最大尺寸而定。
当模型超过3D打印机的最大尺寸,模型就不能完整地被打印出来。在Cura软件中,当模型的尺寸超过了设置机器的尺寸时,模型就显示灰色。物体模型最大尺寸根据您使用的机器而定。


6、物体模型的最小厚度打印机的喷嘴直径是一定的,打印模型的壁厚考虑到打印机能打印的最小壁厚。不然,会出现失败或者错误的模型。一般最小厚度为2mm,根据不同的3D打印机而发生变化。


7、45度法则。任何超过45度的突出物都需要额外的支撑材料或是高明的建模技巧来完成模型打印,而3D打印的支撑结构比较难做。添加支撑又耗费材料,又难处理,而且处理之后会破坏模型的美观。


8、设计打印底座用于3D打印的模型最好底面是平坦的,这样既能增加模型的稳定性,又不需要增加支撑。可以直接用平面截取底座获得平坦的底面,或者添加个性化的底座。


9、预留容差度对于需要组合的模型,我们需要特别注意预留容差度。要找到正确的度可能会有些困难,一般解决办法是在需要紧密接合的地方预留0.8mm的宽度;给较宽松的地方预留1.5mm的宽度。但是这并不是绝对的,还得深入了解你的打印机性能。


下面介绍几个可以检查模型是否有错误的软件。
NetFabb:该免费软件可以编辑STL文件,它可以用来打开STL并显示模型中存在的一些错误信息。
      其中包含的针对STL的基本功能:分析,缩放,测量,修复。Magics:可以按照你想象的效果来精确修复和操作STL文件。
      在众多本地应用程序中,有效修复STL或模型问题,使用Magics是相当有效率的。许多需要在本地应用程序处理的任务可以在Magics上更快的实现。这个程序主要为使用光固化机(SLA)的工程师设计,他们已经开始整合一些很有意思的建议,来帮助修复建筑文件中出现的问题,如“收缩表皮”问题。Magics可以修复漏孔和坏边,联合两个布尔型的固体,倒置三角形的法线,创建壳结构或有其他特点的固体。

来源:3D虎


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