To hollow a 3D cosplay model with wall thickness, use 3D software (e.g., Blender, Fusion 360) to create an offset inner surface and subtract it from the outer, leaving a lightweight, consistent shell—ideal for wearable pieces.
- **Blender (beginner-friendly):** Use the "Solidify" modifier. Select your model, add the modifier, and adjust the "Thickness" slider (2–5mm for most parts; thicker for large armor). - **Fusion 360 (precision):** Use "Offset Surface" to make an inner layer, then "Boolean Subtract" to remove the inner volume.
Test a small section first to check weight and durability—this prevents wasting material on too-heavy or fragile pieces.