What Is 3D Printing?
3D printing is an additive manufacturing technology that creates three-dimensional objects layer by layer from a digital model.
Unlike traditional subtractive manufacturing processes such as CNC machining, milling and drilling, 3D printing does not start with a large block of material and remove unnecessary parts. Instead, it adds material only where it is needed according to a digital design.
In simple terms:
Traditional manufacturing: Material → Cutting/Machining → Product
3D printing: Digital model → Slicing → Layer-by-layer printing → Product
This makes 3D printing particularly useful for rapid prototyping, complex geometries, customized products and low-volume manufacturing.
How Does 3D Printing Work?
Although different 3D printing technologies use different materials and forming methods, the basic workflow is similar.
1. Create a 3D Digital Model
The first step is to create a three-dimensional model using CAD software such as SolidWorks, Fusion 360 or other 3D modeling software.
3D models can also be downloaded from online libraries and saved in formats such as:
- STL
- OBJ
- 3MF
The digital model defines the shape and dimensions of the final product.
2. Slice the 3D Model
A 3D printer cannot normally print the complete 3D model directly.
Instead, slicing software converts the model into a series of two-dimensional layers.
For example, if a model is 100 mm high and the layer height is 0.2 mm:
100 ÷ 0.2 = 500 layers
The slicer also generates important printing instructions, including:
- Layer height
- Printing speed
- Infill density
- Printing path
- Support structures
- Nozzle temperature
- Bed temperature
- Cooling parameters
The resulting instructions are commonly converted into G-code or another machine-readable format.
3. Build the Object Layer by Layer
The 3D printer follows the instructions generated by the slicer and creates the object one layer at a time.
Different technologies use different methods:
- FDM: Melts and extrudes plastic filament
- SLA: Uses a laser to cure liquid resin
- DLP: Uses projected light to cure resin
- SLS: Uses a laser to sinter powder
- SLM/DMLS: Uses high-energy lasers to process metal powder
Despite their differences, they all follow the same fundamental concept:
Convert a 3D model into 2D layers and build those layers into a 3D object.
4. Post-Processing
After printing, some products can be used immediately, while others require additional processing.
Common post-processing methods include:
- Removing supports
- Sanding
- Cleaning
- UV curing
- Painting
- Polishing
- Heat treatment
- Surface finishing
Therefore, the final quality of a 3D-printed product depends not only on the printer, but also on the material, printing parameters and post-processing process.
Codewel 3D Printer
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