Earlier it was a round file that used be a chainsaw chain sharpener for a gardener but today there are electric tools that make sharpening cutting chain blades of different sizes in a hassle free manner. An electric tool can do a perfect job but you still can keep a round file for touch ups.
Keep an electric sharpener on your work bench and take a round file in pocket for touch up in the garden or woods. But it is an electric sharpener that can file a cutting chain blade perfectly. A cutting chain is difficult to hold in hands as it has cutting links that can harm your hands. The cutting links are too small to be filed with a round file. But a round file is needed for touch up.
A chainsaw would require filing, when it starts producing saw dust instead of cutting wood into small pieces. A cutting blade should produce fine pieces of wood but it produces dust, it the links are blunt. You will find it difficult to work with a saw that needs to be pushed into the wood. A saw with blunt cutting chain would need thrust as the blunt links can slip on the wood.
Today there are many companies that make electric chain files. But one should buy a chainsaw chain sharpener that is easy to use, safe for the user and that consumes little energy. Money is also a deciding factor for buying an electric file. Shop around on the web and try locating manufacturers of machines and tools. One will be surprised to see manufacturers selling electric files at cost effective price. This tool can be bought at $37 from a manufacturer.
It is a chainsaw chain sharpener that completes a chainsaw. Buy a saw with a sharpener and also buy a cutting chain blade for use in future. In this way, you can complete your set of chainsaw. If you are using a saw without a file then you might need changing the cutting chain blade as soon as the blade loses its strength.
Whether your saw is a regular tool or you use it occasionally, it needs maintenance. In the absence of maintenance, you might it unsuitable for work after using it a couple of times. On the contrary, buying a chainsaw chain sharpener can keep your saw working all the time. You can find the tool that is just perfect for your needs.