J-Max
A CNC metal-bodied manual espresso grinder with titanium-coated steel burrs and an aluminum catch cup - the grind path and grounds are metal; the only bean-contact plastic is a removable PC hopper lid.
Plastic-free verdict: Minimal plastic contact
The body is stainless steel and aluminum alloy, the burrs are 48mm titanium-coated stainless steel, and the magnetic catch cup is anodized aluminum - so the grind chamber and the grounds path are metal. The one piece of plastic that touches beans is the PC (polycarbonate) lid that caps the hopper; it is removable and only briefly contacts beans as you load them. A leather grip, wooden knob, and silicone/rubber anti-slip base round it out (none in the food path). Very close to plastic-free, held back only by that hopper lid.
Verification: Manufacturer confirmed · reviewed 2026-07-06
What it's made of
| Part | Material | Food contact |
|---|---|---|
| body stainless steel and aluminum alloy CNC construction | Stainless Steel (304 / 18-8) | No |
| burrs 48mm titanium-coated stainless steel conical burrs | Stainless Steel (304 / 18-8) | Yes |
| hopper lid PC (polycarbonate) lid caps the hopper; removable, the only bean-contact plastic | Plastic (other / unspecified) | Yes |
| catch cup magnetic anodized-aluminum cup; grounds collect here | Hard-Anodized Aluminum | Yes |
| catch cup base silicone anti-slip base on the cup; not in the food path | Silicone | No |
| knob wooden ball on the crank handle | Wood | No |
| grip leather grip on the body (listed as wood for lack of a leather entry - natural material either way) | Wood | No |
| anti-slip band | Silicone | No |
A precision manual grinder aimed at espresso, with 1Zpresso's hallmark external numbered grind adjustment and a CNC-machined metal body. Nearly the entire coffee path is metal: titanium-coated stainless burrs grind into an anodized-aluminum magnetic catch cup. The only plastic that beans contact is the polycarbonate hopper lid, which is removable and only touches beans while loading. That makes it one of the cleaner grind paths among popular manual grinders, though not technically plastic-free.
Pros
- Metal grind chamber and anodized-aluminum catch cup - grounds path is metal
- Titanium-coated stainless steel burrs; excellent espresso-capable grind
- Only bean-contact plastic is a removable hopper lid
- Precise, repeatable numbered grind adjustment
Cons
- PC (polycarbonate) hopper lid touches beans on loading
- Aluminum in the catch cup (anodized) rather than steel or glass
- Premium price for a manual grinder
Notes
- Sister models (JX-Pro, J-Ultra, JE-Plus) share the metal-body, aluminum-catch-cup, PC-lid pattern
- Sold as J-Max and J-Max S; materials are equivalent for the plastic-free question
Categories: Coffee Grinders
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://1zpresso.coffee/product/jmax-spareparts/ official spare-parts list names a "PC lid", "Magnetic catch-cup", wooden ball, leather grip, anti-slip rubber
- review https://www.coffeeness.de/en/1zpresso-j-max-review/ body is stainless steel and aluminum alloy; 48mm titanium-coated stainless burrs; magnetic catch cup with silicone base
- review https://craftcoffeespot.com/grinder/1zpresso-j-max-review/ describes the catch cup as metal (anodized aluminum) and the overall build as wood/PC/silicone/stainless/aluminum