Did my zero move or am I losing it?

[Pipe And Punch]

Machine / revision: Breville Bambino BES450 2025
Country / voltage: Australia / 230V
Grinder / burrs / setting / calibration: Baratza Encore ESP; stock conical burrs; 16 on the ESP range; calibration tab in stock position.
Basket / portafilter: 18 g IMS precision basket; bottomless portafilter (54 mm system where applicable).
Bean / roast date: Costa Rica Tarrazú medium roast; roast date 2026-07-20.
Dose / yield / extraction time: 18.0 g in, 36 g out, 28 s target/current reference.
Water / temperature: filtered tap, about 80 ppm hardness; 92°C.
Exact symptom: Spouted portafilter looks normal, but bottomless use reveals side spray and early blonding.
Tests already performed: Repeat with level tamp, wdt kept shallow and a paper-thin headspace check Already cleaned the obvious removable parts and repeated the test once.
Diagnostic photograph or video: close-up of the basket/puck plus a short flow video.

I can make this shot look good on a timer and still taste wrong. Before I waste another bag of beans on the Breville Bambino BES450 2025, I want a second set of eyes on the setup.

[Pipe And Punch]

Confirmed solution: I fixed distribution and headspace first, then made one small grind change. The spraying/channeling stopped on the next repeatable shots. I am leaving the original numbers above intact so the next person can see what changed.

[Garden In Order]

Inference only: because the symptom is repeatable and your listed tests already rule out some obvious causes, I would suspect the narrowest remaining mechanical/setup path before a board-level failure. I would not buy a part from that inference alone.

[Okra]

Short answer: Start with the simple reproducible test before buying parts.
Applies to which model/revision: Breville Bambino BES450 2025.
Likely cause: The symptom points first to a setup, wear-part or calibration issue that can be separated from a major failure.
Test to perform next: Return one variable to a known reference, repeat twice, and record whether the symptom changes in the same direction.
Expected result: If that subsystem is the cause, the symptom should change predictably rather than randomly.
Safety limit: Do not chase the shot with unsafe pressure/temperature modifications; return to stock limits if diagnosis becomes uncertain.
Evidence: First-hand owner experience with the same model/configuration; not a manufacturer diagnosis.

[Folklore]

The useful documented check is the revision-specific maintenance/service sequence, not a generic espresso-machine video. For Breville Bambino BES450 2025, verify the manual procedure and part number before opening or ordering anything. If the documented test does not reproduce the fault, stop treating that subsystem as proven.

[Marginalia]

Not the exact revision, but I had a closely related setup with the same general failure mode. The thing that saved time was separating the Baratza Encore ESP / puck-prep side from the machine side instead of adjusting both together. Similar experience, not proof for your unit.

[Pipe And Punch]

This is a good example of why the exact revision and test history matter. “My Breville Bambino BES450 2025 is bad” produces twenty theories; the measurements above at least give the theories somewhere to die.

[Author]

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