r/Damnthatsinteresting 1d ago

Image Ball point pen tip under microscope

Post image
1.6k Upvotes

8 comments sorted by

View all comments

12

u/kentaki_cat 1d ago

It's amazing how smooth the surface of the ball is compared to even the metal ring that is holding it.

No wonder it once counted as a huge industrial achievement to be able to produce parts with such a precision (and cheap!)