Factor

33M

233M / 233MA

Design / Engineering Improvements

Older design, “standard” Mazzer flat burrs.

Updated version — refined cutting geometry, possibly tighter tolerances. Mazzer claims the 233M are “a big improvement on the 33M blades.”

Grind Speed / Efficiency

Good speed & performance, but maybe slightly less efficient than 233M under the same conditions. Users report that 233M grind a bit “faster / more cleanly” (less heat buildup, cleaner cuts).

Particle Distribution / Grind Quality

Solid and acceptable for many uses; may have more fines / more variation at finer espresso settings compared to the newer set.

Reports suggest 233M have better consistency (fewer fines, more uniform particle size), which helps with shots, probably due to updated geometry or sharper edge.

Wear & Lifespan

Durability is good; Mazzer rates 33M flat burrs similarly (in “burr service life” charts) as 233M for some models. The specs show both 33M and 233M have service life (flat) ~400kg (for Super Jolly).

Maybe slight improvement in life due to improved hardening, finishing etc., but officially listed the same wear weight. So gains are more in quality / performance than in huge life increase.

Cost / Availability

Older / legacy, so can be cheaper or available via surplus. But sometimes supply can fluctuate.

Being newer, might cost slightly more, but also being the current OEM, more readily available. Also marketed as “standard on Super Jolly V Pro” etc.