Capacitance pen's self-made method 1: cut the sponge into 6x6x 15mm strips, cut the front end into an angle convenient for holding the pen, wrap the sponge with double-sided tape and fix it on the pen, and the writing surface must be flat. Cut the tin foil of cigarette case into strips of 1.5x5mm, first stick the middle of the tin foil and the writing side, then stick the tin foil to the pen core along the sponge, and finally stick the two sides to make it conductive. Stick double-sided tape on the refill and wrap it with tin foil.

Capacitance pen's homemade method 2: Prepare materials: an idle pen, a piece of tin foil in the cigarette case, a knife, adhesive tape, a large cotton swab, aluminum foil or a piece of tin foil for the oven. Try inserting a cotton swab into the hole of the nib. If the hole is too small, cut a small piece with a small knife to expand the range of the hole.

Insert a cotton swab into the hole of the pen tip and press it tightly with a little force. Wrap the pen holder with aluminum foil, and wrap it tightly, not too hard, because aluminum foil is easy to break. After wrapping it, you can touch it a little to make it tighter. 8 cotton swabs should be exposed. Wrap the wrapped pen with adhesive tape and fix the aluminum foil paper.

Wrap the tin foil in the cigarette case around the tip of the cotton swab and try to smooth the nib. Wrap the wrapped cigarette case with adhesive tape, and let capacitance pen finish the final test of capacitance pen effect.

The reason why the pen holder uses aluminum foil paper as an oven is because it can conduct human current and is relatively strong and wear-resistant. The tin foil in the cigarette case is used in the pen because it contains paper, is softer than aluminum foil, does not scratch the screen, and can conduct electricity.