Tiếng Việt
Rapid prototyping with a 3D printer looks easy, but it isn’t. It takes many steps to make a good-looking, highly accurate part. So what matters most here?
Step 1. 3D scanning.
ATOS Core 300 3D scanner | 5MP x 2 resolution
First we 3D scan the real model, then scale it to the exact size the customer wants. Notes:- The scanner needs high enough resolution to capture all the lines and sharp edges of the part.
- The scanner must be accurate enough to keep the correct proportions between parts of the model.
The file as shown on the computer.
The file as shown on the computer.
Step 2: Scale up.
Step 3: Rapid prototyping.
The part after 3D printing
The part after 3D printing 
The part after 3D printing
Notes:
- The 3D printer must have an enclosed build chamber with heat circulation so the part matches the 3D file as closely as possible, without shrinking or changing size due to the environment. Here we use a Cubicon 3D printer (a Korean 3D printer) for the 3D printing step.
Rapid prototyping is already used in many fields, from mechanical engineering (R&D) to sculpture (composite molds, silicone molds…) and casting (iron, bronze), and it will gradually spread to many more. It saves up to 80% of the time spent on prototyping and raises productivity. It also makes better-looking models with 100% consistency in size and shape.
Nguyen Van Cuong
Zalo/ Viber/ Skype: 0975 008 728
Contact CT3D Group
CT3D Group – professional 3D printing, 3D scanning, design and rapid prototyping services nationwide.
- CT3D Thu Duc – Ho Chi Minh City, Hanoi, Hai Phong: in3d.edu.vn – Hotline 0975 008 728 (Mr. Thai)
- CT3D District 6 – Ho Chi Minh City: 3dmaker.vn – Hotline 038 7798308 (Mr. Phuc)
What matters most in rapid prototyping for bronze casting
The article asked: in the chain of 3D scanning, scaling and 3D printing, what matters most? The practical answer is consistent accuracy through the whole process. One weak link drags down the quality of the entire model. If the scan data lacks detail, even a perfect print will lose it. If the printer shrinks the part, even a perfect file will give the wrong proportions.
- Input data: scan at enough resolution to keep lines and sharp edges, especially on faces, patterns and engraved text.
- Digital processing: scale uniformly, check wall thickness, and leave allowance for finishing and metal shrinkage.
- Stable 3D printing: use a printer with an enclosed chamber and steady temperature to limit warping, and pick a suitable layer height.
- Model finishing: sand, fill and prime so the model surface is smooth enough before mold making.
Mold making options from a 3D printed model
Once the 3D printed model is ready, the foundry can choose from several mold making methods depending on quantity and alloy:
| Method | Description | Best for |
|---|---|---|
| Sand mold | The 3D printed model is pressed into sand to form the mold cavity. | Large castings where the surface does not need to be very smooth. |
| Silicone mold for wax patterns | A silicone mold is made from the print, wax is poured many times, then investment cast. | Statues and artwork that need detail and repeat production. |
| Direct casting of the print | The part is printed in a clean-burning material and used like a wax pattern. | One-offs, small parts, jewelry. |
For statues and artwork cast many times, silicone molds are a popular choice because they hold detail well and can be reused many times. Learn more about our silicone mold making service from 3D printed models to choose the right process for your product.
Finally, archive both the edited 3D file and the print settings for each model. When a customer reorders or needs a different size, the shop just opens the file, adjusts it and prints, with no need to start over.
Frequently asked questions
Can a 3D printed model be used directly for bronze casting?
Yes, if it is printed in a clean-burning material made for investment casting. With ordinary plastics like ABS or PLA, the print is usually used as a master pattern for a sand mold or silicone mold.
Why is my 3D printed model a different size than the file?
It is usually caused by material shrinkage as it cools, an unstable chamber temperature, or the part warping on the build plate. A printer with an enclosed chamber and the right settings helps limit this.
Does scaling a casting model on the computer keep the right proportions?
Yes. Scaling in software keeps the proportions of the whole model. However, when you scale up a lot, recheck wall thickness and small details to suit the casting process.
What does a 3D printed model need before mold making?
The model needs sanding to remove layer lines, filling of small holes and priming for a smooth surface. Any defect on the model will transfer to the mold and the casting.
Related services at CT3D Group
- Silicone mold making, vacuum casting
- Custom 3D printing service
- 3D scanning service – high-accuracy 3D scanning
- CT3D Group network: ct3dgroup.com · in3d.edu.vn – Hotline/Zalo 0975 008 728
