Free until midnight PT today: Understanding 3D Printing http://www.amazon.com/Understanding-3D-Printing-Basics-ebook/dp/B00DS8RASG/
Awesome, just got it!
Great post thnx.
Thank you for the heads up! 
I got it just in time. Thanks @Al_Williams
Thanks. Got it too.
Parts 2&3 are $3, nice tru
Hi Luis. Well it is branding. The books stand alone (part 4 is coming). I wanted some branding across the books. Watch for future promos. And to everyone, thanks. We gave away thousands of copies yesterday!
For the record here is part 2: http://www.amazon.com/Understanding-3D-Printing-Hardware-ebook/dp/B00DSCR92E and part 3: http://www.amazon.com/Understanding-3D-Printing-Software-ebook/dp/B00DTGB1YQ – part 4 will be out very soon… just a little more to go.