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inner_dia = 3.0; outer_dia = inner_dia + 2*1.5; height = 18.0; eps = 0.1; module standoff() { difference() { cylinder(h=height, d=outer_dia); translate([0, 0, -eps]) cylinder(h=height+2*eps, d=inner_dia); } } module standoff_group() { standoff(); } standoff_group($fn=25);