Operator A says that 3D printers can print anything, Operator B says they can only print in specific materials. Which one is correct?

Operator A says, building a kit 3D printer is an excellent choice because when you build it you learn the ins and outs of the machine and it can be easier to work with, Operator B says professional desktop machines are an excellent choice because they provide documentation and support to troubleshoot issues with.

What is a reason why 3D printing has not become ubiquitous in the world today?

What opportunities do service bureaus offer that most 3D printing users not have the ability to do?

Which of these terms are synonymous with one another?