Time to read: 5 min
我们得到很多的问题最好的方法fastening different 3D printed components. When prototyping hardware products, for example, you often need to make assembled structures that are more complicated than a single 3D printed component, like an electronics enclosure or robotic assembly.
其他时候，您可能需要打印太大的组件，以构建3D打印机的信封，因此您需要考虑永久或间歇地将印刷零件组装在一起的方法。
One of the ways to assemble 3D parts is withsnap fit components，但另一种很棒的方法是使用螺纹。
There are a lot of different ways to implement threads into your 3D printed part so we’re going to cover the pros and cons of the most common methods as well as specific installation steps to help get you started.
Threaded Inserts
Our go-to method, and the one we recommend most often, is using threaded inserts due to its easy installation and high quality feel.
Pros
- Fast, easy and clean
- 无限的组装/拆卸
- 生产质量
Cons
- More expensive
- Requires increased wall thickness
材料和工具
- Brass Inserts
- 烙铁
- Exacto knife
Installation Steps
Place your insert into the associated hole it will be pushed into
Take your heated soldering iron, place it in the middle of the insert and apply a small amount of pressure
As the insert starts heating up you’ll see it sink into the hole
Once the insert looks to be flush with the part surface, use your exacto blade to check and trim away any extra material
Here’s有用的视频to guide you through these steps.
Self Threading Screws
螺纹插入物的另一种方法是使用自螺纹螺钉。如果您想要快速而肮脏的东西，这是最简单，最便宜的方法，因此，如果这是您的第一个原型，或者您使用的是低分辨率的材料PLA, self threading screws are a great option.
Pros
- 简易安装
- Minimal design requirements
- Cheap
Cons
- 脆性材料可能会破裂（即。Verowhite）
- Limited assembly/disassembly
- Low strength
材料和工具
Installation Steps
It’s as easy as a screwdriver and a screw… just twist
将线程设计成3D模型
当您设计一个需要非常大的线程的零件时，最好的方法是将线程设计为3D模型本身。
Pros
- 可以设计自定义线程
- Good when inserts aren’t available (ie. M50 thread)
- 与脆性材料搭配得很好
Cons
- Threads will wear down over time
- 难以准确建模
- Requires high resolution prints
材料和工具
- 没有（仅CAD）
Installation Steps
确保您的线程准确建模（使用模型中的方程式驱动功能 - 这是有用的resource for modelling in inches，aresource for modelling in millimeters）
使用高分辨率材料打印组件（例如Verowhite）
对于内部线程，请使用水龙头“完成”线程。如果您没有水龙头，请尝试使用机器螺丝。
For external threads, use a steel nut sized to your thread dimension and use this to finish the threads on your component.
Be sure to tap completely through the component for through-holes — this will ensure excess material is removed from the tapped feature and prepare the part for fastening.
For blind holes, be sure you’ve tapped deep enough for assembly and make sure to clean any excess material (trying to torque fasteners into components with debris could damage your features).
使用此方法将线程添加到印刷零件时，请确保保持垂直对齐螺纹功能；值得谨慎的谨慎避免交叉读取，这可能会对零件造成永久性损害。
Cutting Threads with a Tap
This is the most traditional method for using threads. In subtractive manufacturing, once a CNC places holes where threads will go, a drill tap is used to create the desired threads in each hole.
When prototyping with 3D prints, you can use the same method with a hand drill tap to create threads in your plastic prototype.
Pros
- Better assembly/disassembly than self threading screws
Cons
- Low strength
- 随着时间的推移，塑料线磨损
- 时间密集
材料和工具
- Drill tap
- Screws
Installation Steps
Tap the threaded feature with a corresponding drill tap to cut usable threads
施加扭矩时，请注意不要损坏组件
捕获的十六进制坚果
将组件固定在一起的另一个常用策略是创建用于捕获十六进制螺母的印刷口袋。
Pros
- Low cost solution
- Good holding force
- 轻松安装
Cons
- Only works on outside surfaces
- 捕获螺母需要额外的材料
- 设计约束
材料和工具
- Hex nut
- Screws
如何使用此方法
Measure the size of your fastener — here’s一个很好的资源to help you out.
在孔尺寸中添加一点公差（0.005“ - 0.010”），以适应任何维误差。
在将螺母放入口袋中之前，在将螺母放入口袋中，在将其粘贴到内部口袋表面上。否则，当您将扭矩施加到螺母上时，可能会从口袋中拉出
Pro Tip:有关装修和宽容的更多信息，请挑选Machinery’s Handbook
Mechanical Considerations
Here are three questions to help you consider which method is best for your project:
Will you need to disassemble and reassemble the components?
What are your strength requirements or holding forces?
What are the geometric or spatial constraints inherent in the design of your parts?
Additionally, here are three important considerations to keep in mind as you design your fastening features:
通常应避免沿平行于印刷的轴线弯曲，因为印刷组件在该方向上在结构上弱得多。
添加组装功能时，请注意材料的允许应力和应变。
在添加固定功能之前，请仔细检查您的CAD型号。IE。如果您添加了十六进制螺母，请检查所使用的十六进制螺母的高度，如果使用螺纹插件，请检查您正在安装的插入物的音高。
With these ideas in mind, you should have no trouble creating larger, more complex assemblies with your 3D prints, and for additional questions ,send us a note at team@ficitv.com.
有没有提及对您有效的方法？让我们知道so we can add it to the list!
