Similar to the theory behind the BigStep, this increased area improves the evenness of extraction allowing you to extract all the flavours from your coffee and avoiding channeling down the untamped basket sides.
Like the principles surrounding the invention of the BigStep, the angled side-wall avoids any binding, suction or vacuum which may happen with larger diameter bases.
The NexusPro is only designed for use with Pullman Filtration or other precision baskets. The bottom edge of the NexusPro is sharp, and should be treated like a chef’s knife. Never drop it on a hard bench or floor, or knock it against other objects; the edge will deform and can cause an imperfect fit or uneven extraction. It will not be replaced or refunded due to misuse or carelessness.