Pull more balanced shots at a coarser grind with the Introvert Step-Down Portafilter Basket - an espresso basket that mounts in a standard 58mm portafilter and steps down to a 49mm extraction chamber. Holding the same dose in a narrower zone builds a deeper coffee bed, so resistance comes from the depth of the puck rather than from grinding finer and finer. The result is less channelling, fewer dry spots, and shots that carry their sweetness without the astringency that creeps in when a puck is pushed too fine.
Each basket is CNC-machined from a solid block of 304 stainless steel, which is what allows the perfectly vertical walls through the full depth of the extraction zone and a thickened base that shows little to no flex at 9 bar. Because the walls never change diameter, the laser-cut holes run right to the outer edge, and a tamper or puck screen seats identically at any depth. The angled step-down drops loose grounds cleanly into the 49mm zone with a tap instead of catching them on the ledge.
Machined from solid steel, the basket resists the corrosion and gradual distortion that come with daily use and hot water. It arrives with the step-down dosing ring, tamper and puck screen all sized to the 49mm zone, so dosing and tamping to the right depth works from the very first shot. You will still need a 58mm bottomless portafilter - the basket runs taller than a standard one, so a spouted portafilter won't close over it.
Introvert Step-Down Portafilter Basket
49mm Extraction Zone - Concentrates flow into a smaller chamber, building a taller puck that reaches full extraction at a coarser grind.
CNC-Machined 304 Stainless Steel - Cut from solid billet for exact geometry, sharp edges and a base that holds its shape under pressure.
Vertical Walls - No change in diameter through the extraction zone, so pressure stays even at every depth of the puck.
Fibonacci-Inspired Hole Array - Laser-cut holes spaced right to the absolute edge of the basket for even flow across the whole bed.
Two Dose Capacities - Choose 16 - 18g for a tight dose with minimal headspace, or 20 - 22g for a full dose that also takes lower ones.
Three Flow Rates - Low, Medium and High hole patterns give three different extraction speeds at the same dose.
This Product Includes
- 1 x Introvert Step-Down Espresso Basket (Beta V0.5 Edition)
- 1 x 3D-Printed Dosing Ring
- 1 x 3D-Printed 49mm Simple Tamper
- 1 x 3D-Printed Portafilter Stand
Specifications
| Materials | 304 Stainless Steel |
| Mounting Rim | 58mm |
| Extraction Zone | 49mm |
| Flow Rate | Low, Medium or High |
| Dose Capacity | 16 - 18g or 20 - 22g |
| Care | Hand wash only; avoid detergents or dishwasher use |
| Portafilter Compatibility | 58mm Bottomless (will not fit spouted portafilters) |
| Machine Compatibility |
Argos Odyssey, Flair 58, Flair 58+ 2, Gaggia Classic E24, Gaggia Classic Pro, KitchenAid KES6551SX, La Marzocco Linea Mini (with 58mm Sworks Billet Shower Head), Lelit Bianca V3, Londinium Vectis, Meticulous, Rancilio Silvia with Countersunk Screw Mod
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| Tamper Compatibility |
Normcore 49mm Tamper Please note: This basket is not compatible with Puq Press 58mm tampers |
| Dimensions |
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