For four decades, miller design has optimized for one material: dry cannabis flower. Diamond-cut teeth, magnetic lids, kief catchers — every refinement assumed a substrate that crumbles cleanly under shear force.

Dense Rosin behaves nothing like flower. It is dense, oily, and thermally reactive. Pressed under your fingertips it warms, softens, and adheres to anything it touches. Drop a piece into an aluminium miller and within three rotations the teeth are coated, the threads are seized, and the resin you paid premium for is smeared across surfaces you cannot reach.

The fix is not a coating. PTFE wears off. Anodising flakes. The fix is geometry. H-Masters' teeth are CNC-machined with a 14° rake angle and a polished mirror finish that gives resin nothing to grip. The chamber walls are slanted inward by 6°, so gravity does the work a traditional flat floor cannot.

We tested 47 miller geometries over 18 months. The winning design moved 99.2% of the dense rosin from input to output across 200 consecutive grinds — with no cleaning between cycles. That is the standard we ship at.