How to bulid a 3D printer by ourself?

I don't know have anyone of you build a 3D printer by yourself?
I just saw a 3D printer course like something at the blog of sainsmart

http://www.sainsmart.com/blog/3d1/
http://www.sainsmart.com/blog/3d2/
http://www.sainsmart.com/blog/3d3/

maybe this blog is under updating, I just so curious, can i really make a 3D printer if I follow the steps. I want to know the feasibility of this project?

 

It is absolutely possible.

However...

Unless you have a lot of the parts already lying around, the cost will not be as cheap as you might hope. I'd have to add up the parts but I think my Prusa i3 build is going to come in at $1,500 ish. Some of that is because I've gone with premium components.

Additionally, there is really no substitute for having your own 3D printer to prints parts for the new printer as needed and having good 3D design skills to modify things to match the hardware you have.

Possible, yes. Easy, no.

That's why I like the Robo3D as a starting point. For a $200-$400 investment in upgrade parts, you can take your Robo to the next level and it's still cheaper than building your own.

 

thanks , according to the blog, I may need the following items
SainSmart ABS filament
SainSmart 3D Printer Kit
dual extruder
PTFE tubing

what else do i need for this project, yes, i am planning to do it.

 

To be blunt, if you're asking what you need to complete a kit here, you are not ready to build a kit.

The incomplete list of things you're going to need:
A frame of some sort (or a bunch of threaded rod)
Printed plastic parts
motors
hot end
Cold end (could be printed plastic, though I don't recommend it)

Do not even think about considering to think about dual extrusion at this point. Until you know how 3d printing works, dual extrusion is pointless. You have to be able to model for dual extrusion and the software isn't easy for that yet. Heck, software for single extrusion isn't easy yet.