Design for 3D Printing

by:INDUSTRIAL-MAN     2019-09-09
Added material manufacturing or \"3D printing\" brings economic benefits and high
High quality prototype and small
Operating manufacturing within the scope of consumer control.
However, 3D printing has not yet reached the stage where printing can be simply clicked.
Unlike 2D printing, designers must be aware of the capabilities and limitations of the machines and technologies being used.
The goal of this tutorial is to serve as a guide for designers.
We will present good design practices and tools for the most common home 3D printers;
Fuse manufacturing (FFF).
In FFF, create the part by pushing the molten material out of the nozzle.
The nozzle tracks the path set and then in-
Fill material.
The resulting part will have a small ridge, which looks like it was formed by laying a layer of spaghetti on the other.
FFF is currently the most common entry-level printer.
The models include the replicators of MakerBot, RepRap Mendel, UP3D, Dremmel, and Cubify.
One of the main challenges of 3D printing is to create digital models that we can produce parts.
Although there are multiple programs, there are only three basic types of programs;
Direct entity modeling and parameter entity modeling based on grid.
For the purposes of this tutorial, we will demonstrate the use of FreeCAD, a freely available, open source parameter entity modeling program.
In this tutorial, we demonstrate: for mobile users, click here.
When we demonstrate the use of FreeCad, there are several other programs that can be used to generate geometry.
They are: Parametric modelers like FreeCAD, using constraint-based models to design solid parts.
While these programs typically have higher learning curves, they provide the most robust way to create models.
To quickly modify the entity, the dimensions of the part can be changed.
Commercial projects include Solidworks, Pro-
And AutoDesk Inventor.
Open source solutions include: FreeCAD, NaroCAD, and HeeksCAD.
The direct solid modeling program focuses on the speed rather than robustness of the part creation.
Modifying the shape or size of a part in these programs is often difficult and can cause problems later.
The free programs available include: AutoDesk 123D, Design Spark, and PTC Creo Elements.
The grid-based modeling program allows you to operate the grid directly.
These programs can easily create 3D shapes.
However, operating the shape requires you to move each point on the part.
For highly complex shapes, this operation can be very time consuming when multiple parts are needed.
Business projects include Rhino3D and Maya3D.
Open source/free program including Blender3D.
After generating the 3D model, we need to consider the material and the manufacturing method.
To do this, we check if there is a side and part that may be difficult to print.
These aspects include: There are several prominent parts of the model in our example.
To allow printing, we need to edit these parts now.
And create an STL file that can be uploaded to the printer.
You can watch this action on it, or click here if it\'s on a mobile device.
The choice of materials is another important aspect of 3D printing.
However, it may not be as important as people initially thought.
Most of the materials used in FFF are thermoplastic polymers with similar mechanical properties.
Common materials, their recommended extrusion temperature, platform temperature and bulk mechanical properties are listed in Table 1.
When choosing to print materials, it is important to recognize that not all printers are created equally, unless specific materials are required, it is recommended to choose to print good materials in the machine of your choice.
The exception to this rule is when extreme material properties are required, such as extreme flexibility of thermoplastic polyurethane (e. g. NinjaFlex).
With the material at hand and the stl files created and modified to print, we can send the parts out of the manufacturing.
There are several services available to you in a very short lead time.
Typically, when printing with a FFF printer, these layers do not fully adhere to each other.
This can cause problems with strength and/or appearance.
Alternatively, it is better to glue together parts that cannot be printed.
If the part is printed with ABS, an easy solution is to use a glass syringe with a methyl acetate (MEK)
, Or acetone produces solvent bonds between surfaces.
The fixture can then be placed outside the part to apply the necessary pressure to form the key.
Be sure to read the instructions for handling acetone or MEK before use.
Please use it in a well ventilated place.
If the parts are printed with PLA, strong glue or other epoxy resin usually does a good job in creating a lasting bond.
If the hole is used, please check if the size of the hole is correct.
If the hole size is too small, the drill can be inserted to expand the hole.
Usually, this can be done by simply turning by hand.
3D printing is a great tool that is changing the way we create it completely.
However, this is not foolproof.
Attention must be paid to the advantages of 3D printing and the design around its limitations.
This tutorial demonstrates the use of FreeCAD from concept to model, and then demonstrates the redesign of the print conceptability.
We also discussed other aspects to consider when designing.
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