Normcore Convex Billet Filter Basket Description

The Normcore Convex Billet Filter Basket creates a deeper, higher-aspect-ratio puck within your portafilter by using a reduced internal diameter and stepped geometry, shifting resistance generation from grind fineness to shape-driven flow control. This fundamentally different extraction regime allows you to explore slower, more controlled espresso draws while maintaining clarity and texture in the cup.

Rather than relying solely on finer grinds to limit flow, the convex profile increases puck thickness and confinement to generate resistance, supporting coarser grind settings with steadier flow and reduced fines production. This design is engineered for low-flow and blooming-style extractions and performs best with an ~18 g dose, giving baristas a structured alternative to flat-wall baskets.

Normcore Convex Billet Filter Basket Features

Convex Geometry Extraction – Stepped internal diameter increases puck depth, using shape to generate extraction resistance.

Flow-Driven Resistance – Geometry-driven resistance supports coarser grind settings while maintaining controlled flow behaviour.

Low-Fines Output – Reduced fines production helps minimise bitterness and harshness in the cup.

Supports Blooming-Style Shots – Encourages stable pre-infusion and low-flow profiles.

Balanced Shot Dynamics – Designed to work with a target flow rate of ~1 ml/s (excluding pre-infusion).

Reduced Flow and Standard Flow Options – Available in Reduced Flow (0.18mm) or Standard Flow (0.28mm) hole patterns.

Versatile Portafilter Sizes – Offered in 58mm and 54mm variants to suit common espresso platforms.

This Product Includes

1 x Normcore Convex Billet Filter Basket
1 x Normcore 0.8mm Puck Screen
200 x Paper Filters

Specifications

Materials
Stainless Steel

Compatibility

58mm – Suits the majority of 58mm portafilters
54mm – Breville Espresso Machine models including the Barista Express, Express Impress, Pro, Touch, Touch Impress, Bambino, Bambino Plus, Infuser and Duo-Temp Pro

Hole Diameter

Reduced Flow – 0.18mm
Standard Flow – 0.28mm