The way older people are now will be the way younger people become in the future. Otherwise, where did the so-called annoying old man and noisy old woman come from? They are born by young people, of course! Young people may not have children, but they will definitely give birth to horrible old men and women! Otherwise, how did the so-called annoying old men and noisy old women come about? --This is the most effective curse of time for young people.
The ideal size is 5cm, up to 10cm. Because the nail is very thin, it should be difficult for a hot-melt 3D printer to print well. But the light-curing 3D printer is also very difficult to ensure the smooth printing, after all, it is a voodoo doll, it is possible that no 3D printer can print it out smoothly.