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module screw(type = 2, r1 = 15, r2 = 20, n = 7, h = 100, t = 8)
{
linear_extrude(height = h, twist = 360*t/n, convexity = t)
difference() {
circle(r2);
for (i = [0:n-1]) {
if (type == 1) rotate(i*360/n) polygon([
[ 2*r2, 0 ],
[ r2, 0 ],
[ r1*cos(180/n), r1*sin(180/n) ],
[ r2*cos(360/n), r2*sin(360/n) ],
[ 2*r2*cos(360/n), 2*r2*sin(360/n) ],
]);
if (type == 2) rotate(i*360/n) polygon([
[ 2*r2, 0 ],
[ r2, 0 ],
[ r1*cos(90/n), r1*sin(90/n) ],
[ r1*cos(180/n), r1*sin(180/n) ],
[ r2*cos(270/n), r2*sin(270/n) ],
[ 2*r2*cos(270/n), 2*r2*sin(270/n) ],
]);
}
}
}
module nut(type = 2, r1 = 16, r2 = 21, r3 = 30, s = 6, n = 7, h = 100/5, t = 8/5)
{
difference() {
cylinder($fn = s, r = r3, h = h);
translate([ 0, 0, -h/2 ]) screw(type, r1, r2, n, h*2, t*2);
}
}
translate([ -30, 0, 0 ])
screw();
translate([ 30, 0, 0 ])
nut();
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