Important Parts of a Drip Coffee Machine Drip coffee makers work well for those who wish to make an instant cup of coffee. They function by heating cold filtered water in the reservoir before pouring it over coarsely roasted coffee grounds. Some drip coffee makers include a built-in bean grinder. https://wwwcoffeeeuk83610.blogsumer.com/29922244/why-nobody-cares-about-drip-coffee-maker