First, let's define it. CAD is short for Computer-Aided Design and it is the use of computer software to assist in the creation, modification, analysis, or optimization of a design. It is a manufacturing process that allows us to create 3D models (and 2D drawings) digitally. CAD is the program/software that helps engineers, designers, and even hobbyists visualize the product's construction before it is created.
When it comes to 3D printing, the CAD software allows for the sketching, shaping, and refining of the 3D models on the computer. From there, those digital models can be used to prototype with 3D printing, manufacture at scale, or even create realistic simulations before every producing a physical object.
How CAD Helps Turn Ideas Into Reality
1. Visualizing Your Idea
CAD transforms napkin sketches into precise 3D models. Instead of trying to image what a product might look like, you can actually spin it, zoom in on it, and check every detail visible on your screen.
2. Testing & Adjusting Early
Before spending the money on production, CAD gives you the ability to identify potential flaws and make quick adjustments. This saves time and money compared to traditional design methods.
3. Seamless Transition to Manufacturing
Once a model is finalized, the CAD files can be exported for 3D printing, CNC machining, or even injection molding. The same design can be adapted for both prototype testing as well as full production runs.
CAD and 3D Printing: The Perfect Match
While CAD designs can be created for many uses, not all 3D models are automatically 3D printable. To be printable, the models must be designed with certain rules in mind:
- Manifold Geometry: A printable 3D model must be "watertight". This means it has no gaps or holes in the mesh. Otherwise, the printer won't know what is the inside vs. the outside.
- Proper Scaling: A CAD file might be created in inches, millimeters, centimeters, or feet. Scaling must be checked before slicing for 3D printing. This will ensure the end product comes out the proper size and you do not have resolution issues when manually scaling it within the slicer.
- Wall thickness: If the walls are too thin, the print may fail as the printer may not be able to achieve the thin lines or the model itself may not longer function as intended with that thin of walls. If the walls are too thick, it is a waste of material and impacts the rigidity of the model which typically needs to be taken into consideration. CAD tools allow you to define the precise thickness you need.
- Supports & Overhangs: Some models need supports to print successfully. CAD lets you design with or without these in mind.
Failing to format your CAD design correctly can lead to issues like non-manifold edges, warped parts, or incomplete prints. This is why careful modeling is key.
Popular CAD Programs for 3D Printing
If you're ready to try CAD yourself, here are some commonly used programs for designing 3D-printable models:
- Fusion 360: A professional-grade tool by Autodesk. Popular among engineers and startups. It has parametric modeling and simulation features.
- SolidWorks: Widely used in mechanical designs and manufacturing industries. This program is great for creating precise, functional parts.
- TinkerCAD: A beginner-friendly browser-based CAD program. This one is great for simple designs and educational use.
- Blender: A free, open-source option that is popular for artists and organic 3D modeling. This one requires some extra care to ensure models are printable.
- FreeCAD: A versatile open-source CAD program that is designed for engineering and product design.
Bringing It All Together
At Contrive3D, we use CAD every day to help clients in West Texas and beyond turn their ideas into reality. Whether you need a prototype, replacement part, custom tool, or decorative piece, CAD and 3D printing make it possible.
The process is simple:
1. Start with an idea
2. Develop the idea into a CAD model
3. Make sure it is properly formatted for 3D printing
4. Print, test, and refine until it is exactly what you need
Do you have an idea that could benefit from CAD and 3D printing? We'd love to help bring it to life. Contact us today to get started.