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Sibarist B3 FLAT vs MHW-3Bomber Flat Paper (Meteorite)

Sibarist B3 FLAT
Fits
Flat basket
Flow
Medium · Manufacturer-stated
Material
Paper
Reuse
Single-use
Availability
Specialty only
How it brews
The B3 grade of Sibarist's abaca flat-bottom paper (associated with Matt Winton's flat-bed method), in S and M. Unlike the FAST papers, B3 is a lower-porosity sheet Sibarist rates as medium flow, trading some drainage speed for more body and retention across the flat bed. That medium class is the maker's own framing, not independently measured. It fits the flat-basket seat and interchanges with other flat papers of that fit; a pre-brew rinse is common.
MHW-3Bomber Flat Paper (Meteorite)
Fits
Flat basket
Flow
Unknown · Unknown
Material
Paper · Cellulose
Reuse
Single-use
Availability
In production
How it brews
MHW-3Bomber's flat-bottom paper in the 155 class, a cellulose sheet for flat-bed brewers. It sits in the flat-basket family and interchanges with other 155-class flat papers there rather than with cones. MHW-3Bomber publishes no fast/medium/slow class, so we leave flow unrated. The flat bed spreads the coffee wide the way flat-bottom papers do; a pre-brew rinse is the usual habit.