**reviewed from uncorrected egalley. Please note that quoted material might not appear as such in the final printed book.

From the publisher's description: Includes glossary, websites, and bibliography for further reading. Grade Level Range 3-6, Accelerated Reader Level Range 5.0-5.9

Children's nonfiction/STEM (grades 4-6). There are some imprecisely presented "truths" in here, but overall this is not a bad introduction to 3D printing (probably about as good as most of the other books out there, and sometimes a little bit better). I did think the chapter on 3D printing in space was cool (and new to me), and there were interesting details included ("Skyfall" and other movie productions, fashion applications) that should appeal to a variety of kids. The glossary is pretty short (only 1 page long and containing 10 words/definitions that seem to have been randomly chosen), and includes words like "nozzle" but not "molten" or "die cutter" (the latter of which, in my opinion, could really use some sort of illustrative diagram for explanation, especially since it reappears in later chapters). As a primer, would not serve well for a 3rd grade audience without lots and LOTS of help of a knowledgeable teacher; 3rd and 4th grade teachers would probably just present some of the material (or most likely, read it themselves and create their own, more interactive presentations with which to teach their classes), but 5th and 6th grade students (if they are fairly well-versed in STEM principles) should be able to pick up the subject relatively easily.

p. 9: "With additive printing, no waste is made. Every ounce of material, whether it is plastic, metal, or chocolate that comes out of the nozzle, is used to make the object."
p.12 [inset]: "All 3-D, or 3-dimensional, objects also share features. They are all solid."
p. 42: "Most products are still made on assembly lines. This uses a subtractive process and it adds to the waste that is piled up on the planet. Only when industries fully grasp additive manufacturing will all that waste stop." ( )