Apart from hand nibbler there are electric nibbler drill powered nibbler and pneumatic nibblers and so on.
How to manually cut letering out of sheet metal.
There are three tools that kevin caron uses a lot to get a precise cut from a thin piece of metal.
I have seen a few metal cutting tools such as snips and nibblers but they cut through the metal to get to their point of interest which i only want the lettering to be cut.
One tool is a foot shear or a jump shear.
Another tool is a plate shear for cutting slightly.
The way of cutting sheets with nibbler is to cut punches out of a tiny metal sheet and repeat the process until you get your desired dimension.
How to plasma cut calligraphy letters.