Thermoformed Bell Mold | 3D Printable Christmas Decoration Mold

This model was designed as a solution for creating thermoformed bell-shaped objects, especially for decorative and Christmas-related projects.

The design was originally created as a personal project because I could not find a similar model available on 3D model platforms. The concept is to use 3D-printed components as a forming system and then thermoform a PLA sheet over the mold to create the final bell shape.

The system includes different components designed to position and secure the PLA template during the thermoforming process.

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🧩 Recommended Materials

Different materials are recommended depending on the function of each component:

• Mold: PETG
• Base: PETG
• Thermoforming Template/Sheet: PLA

PETG is recommended for the mold and base because these components are directly exposed to heat during the forming process.

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🔥 Thermoforming Process

The original prototype was thermoformed using a heat gun.

The basic process is:

1. Print the mold and base using PETG.
2. Print the thermoforming template using PLA.
3. Place the PLA template onto the base and mold.
4. Heat the PLA directly using a heat gun.
5. Once the PLA becomes sufficiently flexible from the heat, form it over the mold.
6. Keep the material in position while it cools and retains the shape.
7. Remove the thermoformed piece from the mold.

> Important: PLA behavior during thermoforming can vary depending on the filament type, thickness, temperature, and heating method. Testing is recommended before producing multiple pieces.

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🎨 Possible Applications

Although this design is particularly suited for Christmas and holiday decorations, it is not limited to seasonal use.

Possible applications include:

• Christmas decorations
• Christmas tree ornaments
• Decorative bells
• DIY projects
• Crafts
• School or university projects
• Prototyping
• Custom decorative objects
• Thermoforming experiments

The final thermoformed piece can be further decorated, painted, or modified according to the user's project.

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⚠️ Safety & Recommendations

The thermoforming process involves working with heated materials. Use the heat gun carefully and follow appropriate safety precautions.

The required heating temperature and time will depend on the filament type, material thickness, and working conditions.

It is recommended to perform small tests first to determine the appropriate heating conditions before producing final pieces or multiple units.

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💡 Design Concept

This model was created as a practical solution for making a bell-shaped thermoformed object using accessible 3D printing materials.

The mold system allows makers to experiment with thermoforming and create their own decorative pieces using a combination of 3D printing and heat forming.

If you create a finished piece using this model, feel free to share your results with the community!