Blender 3D to paper object.

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To unfold a 3D Blender object for printing onto paper, you can use the UV Unwrapping feature. Here's a general overview of the process:

1. **Prepare Your Model**: Make sure your 3D model is complete and ready for printing.

2. **UV Unwrap**: In Blender, select your object and enter Edit Mode (Tab). Then, select all vertices (A) and press U to bring up the UV Mapping menu. Choose the appropriate unwrap method, like "Smart UV Project" or "Unwrap". This will flatten your 3D object onto a 2D plane.

3. **Arrange UVs**: Once your object is unwrapped, you'll see its UV map in the UV/Image Editor window. Arrange the UVs as desired to fit onto the paper. You can scale, rotate, and move the UVs to optimize space usage.

4. **Export Image**: Once you're happy with the arrangement, export the UV layout as an image. Go to the UV/Image Editor window, then Image > Save As Image.

5. **Print and Fold**: Print the UV layout onto paper. Then, cut out the shapes and fold them according to the layout to recreate the 3D object.

This process may require some trial and error to get the perfect layout for your object, but it should give you a good starting point.