Small, Powerful and Cheap Bench Power Supply From ATX Power Supply

Cheap, easy, powerful and AWESOME power supply. You won’t need too much components and its for beginners.
When I said powerful, I mean a really powerful. My ATX PSU can give from 12V 10A, from 5V 10A and from 3,3V 12A which is a lot, but you can have even more powerful one (I had only this one available).
As I said its very easy, simple and cheap (for me it cost about 15$, because I had the ATX power supply for free)
basic soldering
some patience (some things are hard and frustrating)
and drilling”