Plotters are not normally used as a normal printer as they are specialized for making engineering type ( blueprints and line drawings ) of prints.
A plotter is fine if you are going to be making and/or printing patterns that are larger than a normal size of paper - ie 8.5 x 11 or 8.5 x 14 or the metric equlivalints. They have special drivers for the computer for the plotter to work correctly. I am not sure that a plotter would do what you want it to.
The paper for the plotters is harder to locate and is way more expensive than the paper for a normal printer. While the plotter should be able to print out your patterns with out any specialized or special software, the important question is this, Is pattern printing all you will be doing with the printing device you finally choose?
If the answer is no, then a plotter is not an ideal choice. A good printer is a better all around choice for printing patterns and other normal printing such as pictures, and documents. What you finally end up using is a personal choice.
There are many easy to use programs out there for patterns that are oversized that make the pattern print on multipule pages and all you have to do is tape it together. Personally I believe that you would find that having a normal printer will be less of a pain and a lot cheaper. But then this is just my 2 cents
DW