eli5 how is the ball in the tip of the Pen is made/manufactured, how something can be made so small, yet so perfect?

Question

like, it is not only about ball of the Pen, but also about many things, like how small springs are made, and etc.

In: 8

Answer 1

you basically just use a press to squeeze a bit of wire, which increases its diameter by compressing its length. Done right and you end up with a ball. You can also force it through a tiny hole to make it change shape to get things like screws.

Whats more impressive is the billions of transistors on your computer’s central processing unit.