Material preparation:

Color copy paper (it is better to choose thicker paper, which can be more resistant to insertion and brighter in color), scissors, glue or double-sided tape.

Steps:

1. Choose a graphic or design you like, draw the design on a piece of paper and cut it out. This design will serve as your template.

2. Fold your paper into a small triangle, the size of which matches your template. Cut off the excess along the bottom of the triangle.

3. Expand the triangle, and you will see a small triangle and a big triangle. Fold the top corner of the big triangle down to form a small square.

4. Apply glue to the small squares, and then stick the two small squares together to form a three-dimensional square. This is the basic unit of your triangle plug.

5. Cut your basic unit into different shapes according to the shape of the template. For example, if you want to be a star, you can cut the basic unit into the shape of a five-pointed star.

6. Repeat the above steps until you have enough basic units to build your template shape.

7. Plug all the basic units together to form a complete three-dimensional shape. If necessary, glue or double-sided tape can be used to help fix it.

Precautions for inserting triangles manually:

1, choose the right paper: triangular inserts need to use thick paper by hand, which is not easy to break when folding inserts, and can better present three-dimensional effects.

2. Fold carefully: Be careful when folding, and don't tear or break the paper. It is best to use a special origami knife or scissors for cutting and folding.

3, pay attention to plug-in skills: plug-in is the key step of triangle plug-in, you need to pay attention to skills and techniques. Make sure to insert firmly, but don't use too much force to avoid tearing or deformation of the paper.

4. Be patient: triangle insertion requires patience and care, and you can't rush for success. Every step must be carefully completed in order to make a perfect work.

5. Pay attention to safety: Pay attention to safety when using scissors and glue, and don't cut yourself or others. It is best to make it under the supervision of adults.

6. Create your own design: Don't be limited to templates or other people's designs, you can try to create new three-dimensional shapes and patterns yourself. This can give full play to your imagination and creativity.