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module step(len, mod)
{
for (i = [0:$children-1])
translate([ len*(i - ($children-1)/2), 0, 0 ]) child((i+mod) % $children);
}
for (i = [1:4])
{
translate([0, -250+i*100, 0]) step(100, i)
{
sphere(30);
cube(60, true);
cylinder(r = 30, h = 50, center = true);
union() {
cube(45, true);
rotate([45, 0, 0]) cube(50, true);
rotate([0, 45, 0]) cube(50, true);
rotate([0, 0, 45]) cube(50, true);
}
}
}
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