thorny vine fidget spinner 3d model

Design a tri-lobed fidget spinner, 80mm total diameter, with a central hub sized for a standard 608 bearing (22mm outer diameter, 7mm depth, with a 1mm friction-fit lip so the bearing press-fits without glue). The three arms extend symmetrically from the hub at 120-degree intervals, each arm styled as a single curling thorned vine, vine body 6mm wide tapering to 3mm at the tip, with thorns as raised surface detail only (0.5mm relief, not separate pierced/cut-out geometry) so they don't create weak points. Each arm must have identical mass and volume to keep the spinner balanced — mirror the geometry exactly across all three arms rather than varying the thorn placement. Overall thickness 8mm at the hub tapering to 4mm at the arm tips. Minimum feature thickness anywhere: 2mm. Model should be a single watertight solid, printable flat-side-down with no overhangs beyond 45 degrees and no supports needed, hollow bearing seat left open (not filled).