You are entirely free to build a cocaine making machine in most countries. It is actually using it to produce cocaine that is a crime.

In reasonable countries, this is exactly how it works. You can own lockpicks, practice picking locks, and even publish detailed instructions on how to pick locks. It's only when you pick someone else's lock that a crime is committed.

Limiting access to tools and knowledge benefits the wealthy and privileged. Knowledge should proliferate, that is how the world has worked long before I was born and god willing that is how it will work long after I die.