What equipment is needed to 3d print.

There are some threads on 3d printing here but they have fairly general info.
Is someone able to do a quick post on the actual requirements to 3d print a small plastic part?

Attached is an image of the drive pawl from a generator pull-start recoil mechanism.
It is about 2 inches high. I was thinking of experimenting with casting aluminum to replace one but 3d printing could also be an alternative.

But I don't know if it is possible.
It isn't a flat design. I has lugs projecting from either side. Can this still be printed?
How is the design transferred to the printer/computer? Are there 3d scanners?
I assume the printers are connected to a computer or are the printers stand-alone?
How much power do they use?
Is it possible to create your own plastic 3d 'ink' or whatever it is called?
Any hardware of software requirements if a computer is used?

A quick run down of the equipment, software and resources needed would be appreciated.
And the procedure to do the printing. I believe it is a slow process.
TIA.

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What equipment is needed to 3d print.