It is comprehensive in terms of the processes. The format in Kindle isn't the easiest to read and follow having illustrations at the end not in context with subject matter.
I am also missing a lot of troubleshooting type topics I think are very necessary for the subject matter. I can see myself occasionally referring to this but it isn't going to be the all inclusive reference I thought it would be.

Like others have said, if you are a beginner hoping to learn the basics of 3D printing then this book will be great for you. It covers a broad range of topics that are applicable to specific 3D printing technologies. So on that end, it's a great book and I would give it 5 stars.

However, if you are like me and using 3D printing everyday and have been for years, this book will likely not be that helpful to you. I was expecting a more detailed book that really got into the weeds of 3D printing - acceleration speeds, microstepping, back-pressure issues, retraction settings, dual extrusion, direct drive vs. bowden setups, flow rates, etc. I just simply misunderstood the purpose of the book when I bought it. So as for a technical textbook I would only give it 3 stars.

So should you buy it? Well it depends. If you're looking to learn about 3D printing and various applications and nothing more, then yes - by all means. But if you REALLY want to learn about 3D printing, skip the book, save up and buy an actual 3D printer. Getting your hands dirty with a cheap, open-source 3D printer is by far the best way to really learn the depths of 3D printing. Note: there will be times where you'll want to bang your head against the wall, but it's worth it.

This is a superb comprehensive guide on 3D printing, not an on-boarding book for beginners. It is written with cohesive understanding of the entire 3D printing landscape, thus it functions as a manual providing surface to semi-advanced information on all 3D printing technologies, including lesser-known types.
The only downside of this is: to most people familiar with 3D printing (makers who mostly deal with FDM), 70% of the book might be irrelevant, because it discusses industrial 3D printing processes not accessible at this time.
If you need an all-in-one guide on 3D printing as a whole, this is an invaluable resource. If you want a guide to FDM printing and its applications, there might be publications more dedicated to FDM exclusively.

Good introduction with some information that is not widely known. Very good way to get started in the world of 3d printing with some great diagrams.

Practical suggestions, especially helpful to those starting out with 3D printing.