These days, we don't hesitate to purchase a pizza or a whole chicken, but what about the situation when it comes to buying a book? In this age of physical overnutrition, peripheral visual stimulation explodes with videos and mukbangs. Meanwhile, with the decline in direct interaction with others, the place for the wholesome printed word, which soothes our weary hearts, is gradually being pushed aside.
For humans, who find stillness boring and are optimized for three-dimensional visual stimulation, books are treated as a stale product of forced, embodied learning in the harsh educational environment.
And yet, I pick up my pen again.
Why is that?

In fact, preparing a book is like locking yourself in a prison of writing with zero cost-effectiveness.
The book is the result of venting the loneliness and frustration in prison.
Writing a book is such a difficult process, but I confine myself to the prison of writing in hopes of establishing proper lectures and knowledge based on the results I've produced.

Modern society is in turmoil, struggling with the unpredictable future brought about by the sudden onset of the Fourth Industrial Revolution.
Various media outlets mention jobs or positions that will disappear in the future, adding to the anxiety among us living in this era.
I have been an expert in conventional mass production manufacturing methods.
However, as we increasingly recognize that traditional manufacturing methods are under threat, we have begun to compare and learn with 3D printing as a defense mechanism.
As a result, I published a book that summarizes my thoughts and data from conducting comparative research.

The ultimate goal of this book is to properly establish the concept of 3D printing and secure the seeds of wisdom that can penetrate the future.
It can also provide direction to those who are familiar with existing manufacturing methods and are concerned about introducing new methods.
An investment the price of a pizza can give you a balanced view of 3D printing.

Revolutions can dramatically change society, and they can also serve as an opportunity to destroy existing values ​​and establish new ones.
However, after working as an engineer for over 30 years, I realized that professions do not disappear through revolution, but rather progress.
Industrial society can be thought of as a single brick made up of various things such as gravel and sand.

3D printing is also a step forward from various technologies that are deeply rooted in existing industries.
Although this may be somewhat unfamiliar to those accustomed to existing mass production-based manufacturing methods, we have tried to make it as user-friendly as possible.
True progress is built on a solid foundation.
Through this book, I hope to gain a more solid foundation of knowledge, and for the knowledge of the past, present, and future to be fused together like warp and weft, becoming water that merges from a lower position than fire.

I would be most delighted if this book could be of help to engineers, patriots of our time, who, like me, are accustomed to conventional manufacturing methods and fear the coming revolution.