Step-by-Step Guide to Creating 3D Silicone Moulds

If you've already experimented with flat moulds, you're probably ready to take things further. A 3D mould opens up a whole world of creative possibilities—from sculptures and jewellery to detailed resin décor.

🎯 What Is a 3D Mould and Why Try It?

A 3D mould reproduces the entire object in volume, not just one surface. It’s ideal for capturing reliefs, depth, and complex shapes.

Compared to flat moulds, a 3D mould allows:

• More professional results

• More control over colour and finish

• Longer-lasting resin pieces

🧪 Materials You’ll Need

• Two-part liquid silicone (RTV type)

• A solid object to reproduce

• A container to use as a mould box (plastic or cardboard)

• Vaseline or release spray

• Protective gloves, spatula, mixing tools

• Precision knife or scalpel

Pure Mold 10 - Silicone for Crafting and Fine Details
Liquid Mold 20 - Universal Silicone for Crafting and Sculptures
Liquid Mold 30 - Silicone per Stampi Resilienti e Materiali Pesanti

Which Shore Hardness to Choose
We recommend silicone with Shore hardness 10–30.
For delicate details, go for a softer option (10–20): it's more flexible and easier to demould without damaging the figure.

🛠️ Detailed Process

1. Model and Box Preparation
Ensure the model is clean and dry, place it in the container (mould box), and apply a release agent.

2. Silicone Mixing
Mix slowly according to the specified ratios.
⚠️ Avoid incorporating air bubbles.

3. Pouring and Curing
Pour from a single point, about 20 cm high, to allow bubbles to rise.
Let it cure undisturbed for 6 to 24 hours depending on temperature and product type.

4. Final Demoulding
Once fully cured, remove the model gently.
If needed, make a precise incision in the mould for easy access.

📘 Two-Part “Book” Mould Technique

• Shape half of the mould with modelling clay

• Pour the first half of silicone, let it cure

• Remove the clay, apply release agent, and pour the second half

• Add registration keys (bumps) to help the mould align perfectly

🏠 Can This Be Done at Home Without a Lab?

Absolutely. Just follow this guide and use basic tools—amazing results are achievable right from your workspace.

✅ In Summary

• Use two-part liquid silicone

• Choose appropriate Shore hardness

• Mix and pour carefully to avoid air bubbles

• Let it cure properly, and demould with care

• Use a two-part mould for complex shapes

🎯 Final Thought

You don’t need a lab or years of experience. With the right mindset and materials, this guide will help you turn ideas into unique 3D creations.
🧤 Ready to start? Go for it!