3D printing technology has been around for a while now, but it hasn't really taken off in the way that many people thought it would. There are a few reasons for this.
One reason is that 3D printers are still quite expensive. They're not something that most people can afford to have in their homes. Even if you could afford one, the materials you need to print with are also quite costly.
Another reason is that 3D printing technology is still fairly limited. You can't print just anything with a 3D printer - there are certain limitations to what they can do. This means that, for most people, it's not worth investing in a 3D printer when they can't use it to its full potential.
Finally, 3D printing isn't as user-friendly as many people thought it would be. It's not as simple as just hitting print and having your object come out perfectly formed. There's a lot of trial and error involved, and even then you might not get the results you were hoping for.
For all these reasons, 3D printing hasn't really taken off like many people thought it would. It's still a developing technology with a lot of potential, but it's not quite ready for widespread use just yet.