3D printed plastics offer various opportunities when it comes to creating threads or tapped threads in slightly smaller holes. These possibilities arise from the unique material characteristics of the printed parts. Consequently, users have a range of choices to explore. Here we will see on how to embed a nut in the XY plane
1. Designing the Cavity:
The initial step in embedding a nut is the design of the cavity. This process is relatively straightforward. Once the design for the bolt hole is established, the dimensions of the nut to be embedded should be measured. Utilising computer-aided design (CAD) software, create a cavity centered around the bolthole. For instance, when working with an M5 hexagonal nut measuring 7.85mm in width and 3.85mm in height, direct measurements with digital calipers are recommended over relying solely on the specifications sheet, which might indicate dimensions of 8mm x 4mm. To account for tolerances (about 0.05mm on each side), it is advisable to add twice this value (2x0.05mm) to the dimensions. This results in a snug fit, with final dimensions of 8.00mm in width and 4.00mm in height. If a bit of extra allowance is desired, a 0.05mm margin can be added to the design for a more comfortable fit.
2. Adding pauses to Prints:
In the Eiger software, it is possible to introduce pauses during the printing process after specific layers. Prior to implementing pauses, it is essential to ensure that no support structures are present within the cavity of the printed part. The pause-to-print feature can be accessed through the X-Ray view within the Eiger software, located under the 2D view of the part. This strategic use of pauses allows for precise insertion of components, enhancing the overall accuracy of the final assembly.
3. Adding Fiber for reinforcement
To bolster the pullout strength of the embedded nut, the addition of fiber to the printed part is a recommended practice. Fiber should be incorporated both above and below the nut cavity, with the choice of placement depending on the direction of bolt loading. By reinforcing the sides of the nut cavity with fiber, the walls are strengthened, reducing the likelihood of the nut loosening or twisting under stress. This reinforcement ensures a more secure and reliable connection.
4. Printing the Part
Once the design is finalized, it's time to initiate the printing process. There is no need to wait around while the printing is in progress, as Eiger allows for efficient management of the printing timeline. When a pause is triggered, simply insert the nut component and then resume the print. To ensure proper adhesion of the Nylon or Onyx material to the top of the part, applying glue asa n adhesive can be an effective precautionary measure.
5. Dealing with Support Material and more complicated geometrics
For more complex geometries and components that require support structures, it is crucial to remove excess support material from areas where it is not needed. The internal view option and the remove supports feature within the software facilitate the streamlined removal of support structures, resulting in a cleaner and more refined final product.
In conclusion, embedding nuts in the XY plane of 3D printed parts is a process that demand scareful planning and execution. By following these steps and incorporating the recommended practices, users can achieve robust and reliable assemblies that meet their specific design requirements. Whether for mechanical components or structural elements, this approach enhances the versatility and functionality of 3D printed parts, opening up new possibilities for creative and functional designs.
