Just finished reading this. You might want to get this proofread by someone else, because there are quite a few errors (misspellings, grammar, etc.), and there are places where it's hard to read.
Since you broach the subject of alternative printing technologies such as SLA, you might also want to include SLS. It is after all the best printing technology for high quality models. In fact due to it's high resolution accuracy, it's used almost exclusively for prototyping, and low run production.
Something else to consider is your usage of the word "resolution" as it applies to printing. In many places you reference "low resolution" as it applies to the layer thickness.
A 3D printer has basically 2 "resolutions". One applies to its ability to move the printhead in the X & Y axis, the other applies to the layer thickness it's capable of producing.
Most printers are capable of X/Y resolutions of about 300dpi, which comes down to about 0.08mm. The problem with the X/Y resolution is that it's hampered by the thickness of the extrusion. This is where the nozzle size comes into play, or in the case of SLA printer the diameter of the laser beam.
The slicing software can take the extrusion thickness in consideration and inset the outer dimensions in order to produce a dimensionally accurate model. Unfortunately very small details (those less than the extrusion thickness will always be lost).
You also mentioned Open Source vs. Closed Source. Outside of the hardware, one of the most important parts of the 3D printing solutions is the software. Some software like the Affinia software or the MakerBot software are closed source, and while they do provide an easy to use, all in one solution, they have very few options for customization or tweaking.
There's software out there (like this printer that was intended for schools, don't remember its name), that won't even let you print your own objects, only stuff available from their web site or store. That can be a real deal killer unless all you want to print is their trinkets.
Anyway, these are some of the things you need to revisit on your next revision, and clarify them, but for now I think a thorough proofreading is in order.
Good luck with your ebook.
To print or, 3D print, that is the question...
SD3 printer w/too many mods, Printrbot Simple Maker Ed., FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.