I made this oversize Un-Golf Ball with bumps instead of dimples. There are 482 bumps - 162 at the nodes of a subdivided icosahedral array (4 divisions per edge), and 320 at the centers of its small triangles. Golf balls typically have 330-500 dimples.
I modified a drift punch to a 1/4" round end, and punched dimples at the bump locations; then sanded the outer surface to the bottom of the dimples; placed it in boiling water for a few minutes to raise the bumps, and let it dry.
Cherry, 2 3/4" (70mm) diameter; clear gloss polyurethane.
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