Much of the information found in the earlier RepRap blogs is still very relevant today and makes for invaluable reading for anyone interested in developing parts and printers or interested in how the project has reached the state it currently is in.
The following books are collections of these posts repackaged into formats suitable for e-book readers and offline browsing.
The books are also mirrored on the RepRap Wiki.
HydraRaptor – The story so far
Taken from Nophead's hydraraptor.blogspot.com.
A History of RepRap Development
Posts from the core developers blog