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In contrast, Grinder 2, the Kingrinder K6, is more affordable at $129 and designed for intermediate skill levels, offering a manual operation. Both grinders are from reputable brands aiming to provide quality espresso grinding options.","In terms of grinding information, both grinders utilize conical burrs made from stainless steel with the Fellow Opus having a burr diameter of 40mm while the Kingrinder K6 boasts a 48mm diameter. The Fellow Opus features a stepped adjustment, allowing for precise grind size modifications in 5-micron increments, while the K6 also has a stepped adjustment with a coarser 16-micron scale. Both grinders use a single dose hopper type, but the Opus employs a timed auto-stop primary dosing method, whereas the K6 relies on a manual method. This automatic feature of the Opus may appeal to beginners for its ease of use, while the K6's manual operation may give users more control over the grinding process.","Regarding key features, the Fellow Opus has a grind range that accommodates everything from pour-over to espresso and includes swappable burrs for customization, which is valuable for espresso enthusiasts. However, Grinder 2, the Kingrinder K6, has a more limited grind range and lacks swappable burrs but is known for its compact design and portability. Both do not feature adjustable RPM, which indicates they are focused on simplicity and functionality over complex settings. Overall, both grinders cater to specific user preferences, from automatic convenience to manual control, enhancing the espresso grinding experience."]