Instruction: Answer the given question using the supporting document.

Input:
Question: If I wanted to sit this on a thermal carafe, how big does the opening of the carafe need to be?
Document: The only complaint I have is that the part beneath the platform goes a little too far into the mug, but the trade-off is better stability. Also, it might be too big to sit in a small mug, but medium ones or bigger are fine. Depends how narrow the opening of the mug is. But this thing filters super quick!!! And rinsing it just takes like 3-5 seconds. Great for me who needs just coffee for me and needs it right NOW!!!
How much is too much? Sometimes less truly is more. I searched for a replacement #4 cone filter cup in average grocery aisles and the big box stores... they were never seen. Unbleached paper filters, yes... plastic cones, no.Retired on a shoestring and now enjoying the Good Life on my passive-solar wilderness homestead, I've arrived full circle back to the plastic cone w/ filters and a carafe or thermos.
Bought this large one and a small one to take camping. This one fits on top of a large mug or a large mouth coffee carafe, without alteration. The flanges also serve to keep it steady. I had a slightly smaller opening on my favorite mug, so I cut down the flanges a bit to make them fit.Works great, with a filter, or a paper towel will do in a pinch.
Holes too big, not enough steep time...get a real Melitta for the same price.Big squarish holes make the coffee run way too fast.I purchased the little 1 cup melitta and I'm back in coffee heaven.You can get the entire melitta system with the glass can for about $9 if you need the capacity.
I'm SO disappointed. The cross bars that should sit in the cup are too wide for most coffee mugs. And there are 2 BIG holes so the water simply runs through the coffee with the result that I need much more coffee to make a medium strength brew. Prior to ordering this I used a make shift filter holder fashioned out of tinfoil which fit into a mason jar and it neatly held the paper filter. The mason jar withstood the hot water and I could clearly see how much I was pouring in.
Cone filter was as described. Good quality. Makes great coffee - really like this for when you only need to make one or two cups of coffee but it also works great to make a full pot. Can be used with a carafe or on top of a single cup. Very versatile.
To measure coffee and water, heat water, brew coffee, and clean up takes only about five minutes total. This particular cone makes up to 4 cups at a time which is great if you have more than one person drinking coffee. Do note, as other reviewers have, that it will not fit into the top of a typical (tall skinny) carafe or narrow thermos. You'll need one with a wide neck.
It does what it supposed to do, nothing great. I would have liked a bigger reservoir for the water to sit in.
I have been looking for these everywhere. These where bigger than I expected, so have to have a wide mouth cup to sit them in, but work great.
The extra legs mean it doesn't fit the thermal oxo cup I bought. The filter cone I use every day doesn't have a base on it. It works fine.
Answer: It fits perfectly on the opening of an 8 oz mug. I love this coffee maker! S