La Marzocco’s convertible portafilter — one body that swaps between single-
spout, double-spout and bottomless. La Marzocco states it is “Compatible with
all La Marzocco Home machines along with standard 58mm tampers,” so it is
cross-referenced to the Linea Mini, Linea Micra and GS3. As a 58mm
commercial-standard portafilter it takes standard 58mm baskets. Verified
against La Marzocco’s official pages on 2026-07-04.
FAQ
What size is the La Marzocco Convertible Portafilter?
It is a 58mm portafilter, for 58mm portafilter machines.
Does the La Marzocco Convertible Portafilter fit 54mm Breville machines?
No. It is 58mm, so it fits 58mm-standard machines, not Breville's 54mm Barista/Bambino line.
Which machines does the La Marzocco Convertible Portafilter fit?
La Marzocco GS3; La Marzocco Linea Micra; La Marzocco Linea Mini — each confirmed against manufacturer sources (listed below).
Sources
https://home.lamarzoccousa.com/product/linea-micra/(archived) — Official La Marzocco Home (USA) page, read firsthand 2026-07-04. States verbatim: 'The all-new convertible portafilter allows you to easily change between a single-spout, double-spout, and bottomless portafilter. Compatible with all La Marzocco Home machines along with standard 58mm tampers.'
https://home.lamarzoccousa.com/product/linea-mini/(archived) — Official La Marzocco Home (USA) Linea Mini page, read firsthand 2026-07-04, listing the 'Convertible Portafilter' among included accessories alongside the 58mm-standard baskets and convex tamper.