Bottomless Portafilter

1. Concept & Design

Designed to fit the Breville 54mm system, this portafilter is machined from a single piece of aluminium (monoblock construction) to eliminate the weak point found in standard two-piece press-fit designs.

Initial concept sketch exploring the handle geometry.

2. Prototyping

Before cutting metal, the geometry was validated using 3D printed PLA prototypes to ensure ergonomic fit and locking engagement with the group head.

Testing & Validation

The final prototype undergoing fit testing to ensure perfect engagement with the group head.

3. Machining Process

The complex internal geometry required multiple setups. Note that the lugs seen protruding from the handle in the photos are temporary features, designed specifically for workholding and orientation during the milling process.

CAM Simulation of the toolpaths.

Machining the first side.

1st rough cut complete.