dew harvester 3d model

passive helical dew/fog harvester prototype. Total height: exactly 100 mm. Single continuous Archimedean helical ribbon with 3.5 full turns. Base outer diameter 110 mm tapering linearly to 40 mm at top. Ribbon radial width 19 mm, base thickness 3 mm before lattice, with 10-15° inward bevel on inner edge for Laplace droplet guidance. Apply Schoen gyroid TPMS lattice throughout ribbon volume: cell size 4.5 mm, strut thickness 0.9 mm, porosity 72-78%. Preserve 0.8 mm minimum solid outer/inner skins for strength. Central hollow axis: 5 mm diameter with helical micro-grooves (0.8-1 mm deep, 5-6 per turn) for gravity drainage. Ribbon connects to axis for continuous water path. Base: 3 mm tall stabilizing ring,92-95 mm diameter,1 mm bottom chamfer.
Top flange: 4-5 mm tall at z=100 mm, 52-55 mm outer diameter, 43-45 mm inner cutout. All edges filleted 0.5-1 mm. Geometry prioritizes passive chimney airflow, rapid inward/downward droplet transport, ensure drainage continuity from gyroid ribbon