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rLampe = 33/2;
rLenker = 21.5/2;
dGummi = 2;
b = 15;
r = 2;
$fn = 100;
difference() {
rotate_extrude(angle = 170, convexity = 4) {
polygon([
[rLampe-dGummi,b],
[rLampe+dGummi/2,b],
[rLampe+dGummi/2,b+r],
[rLenker+dGummi/2,b+r],
[rLenker+dGummi/2,b],
[rLenker+dGummi,b],
[rLenker+dGummi,0],
[rLenker+dGummi/2,0],
[rLenker+dGummi/2,-r],
[rLampe+dGummi/2,-r],
[rLampe+dGummi/2,0],
[rLampe-dGummi,0],
]);
};
translate([rLampe-dGummi,-1,-r-1])
cube([2*rLenker,2*rLenker,b+2*r+2]);
}
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