How does the paper extractor indicate the lack of paper?

Have you ever run out of paper in the bathroom? Many people may have had this experience, so start making this paper extractor that can prompt the lack of paper.

Materials and methods

1. Add two square openings on both sides of the common paper drawing tube as "indicator ports".

2. Next, install a clamping shaft consisting of a card and a shaft in the clamping groove. The shaft is hollow, one side of the card is marked with the word "paper shortage", and the other side is equipped with a small stick that can be inserted on the shaft, which is slightly larger than the card slot.

3. Install a "shaft clamping groove" as a groove for "shaft clamping" on the inner sides of both sides of the paper drawing tube indicating paper shortage.

When in use, open the paper drawing tube cover indicating paper shortage, take out the "card shaft", then take off the "card" on the "card shaft", then use the shaft to pass through the middle of the toilet paper roll, then press the "card" on the shaft and put the "cards" at both ends of the "card shaft" into the "card shaft slot". Finally, close the paper drawing cover indicating the lack of paper, and it can be used normally. As the toilet paper is used up round by round, the "stuck shaft" will gradually decrease. When it is almost used up, the card will also appear in the "open card slot", thus prompting the lack of paper.