First Raspberry Pi controlled 3D Printer

[DavidS]

http://www.aliexpress.com/snapshot/6...63011881923127

That is just an example. I have no idea if it is the cheapest or not but it seems to me to be less than the RRP of a Raspi.

I am not understanding your "computer to program and send data to the Arduino", doesn't everyone that is reading this forum already have that and why is that bit relevant anyway?

Well I would imagine that we all have a computer. If your computer happens to be a Raspberry Pi (like mine), then you are saving money, as no secondary device needed as a controller.

If your computer is something else, you can use GPIO directly on the other computer (on the PC's use the parallel ports, on Macintoshes use the SCSI interface with $3 worth of 74HCxxx IC's to decode the SCSI, on others use what ever equivalent).

So if you already have a computer you do not need an Arduino (or any other MCU), and I think that is the point.