$fn=360;

AXLE_DIAMETER=5;
BASE_HEIGHT=100;
BASE_LOWER_DIAMETER=100;
BASE_UPPER_DIAMETER=50;
TEST_TUBE_HEIGHT=150;
TEST_TUBE_DIAMETER=10;
TEST_TUBE_ANGLE=33;
TEST_TUBE_SPREAD=90;

module testTube(height, diameter) {
	cylinder(height, diameter, diameter);
}

module arrangedTestTubes(angle, spread, rotation) {
	rotate([0, 0, rotation]) {
		translate([0, spread, 10]) {
			rotate([angle, 0, 0]) {
				testTube(TEST_TUBE_HEIGHT, TEST_TUBE_DIAMETER);
			}
		}
		translate([0, -spread, 10]) {
			rotate([-angle, 0, 0]) {
				testTube(TEST_TUBE_HEIGHT, TEST_TUBE_DIAMETER);
			}
		}
		translate([spread, 0, 10]) {
			rotate([0, -angle, 0]) {
				testTube(TEST_TUBE_HEIGHT, TEST_TUBE_DIAMETER);
			}
		}
		translate([-spread, 0, 10]) {
			rotate([0, angle, 0]) {
				testTube(TEST_TUBE_HEIGHT, TEST_TUBE_DIAMETER);
			}
		}
	}
}

module base(height, lowerDiameter, upperDiameter) {
	cylinder(height, lowerDiameter, upperDiameter);
}

module axle(height, diameter) {
	translate([0, 0, -1]) {
		cylinder(height, diameter, diameter);
	}
}

module centrifuge() {
	difference() {
		base(BASE_HEIGHT, BASE_LOWER_DIAMETER, BASE_UPPER_DIAMETER);
		axle(BASE_HEIGHT + 2, AXLE_DIAMETER);
		arrangedTestTubes(TEST_TUBE_ANGLE, TEST_TUBE_SPREAD, 0);
		arrangedTestTubes(TEST_TUBE_ANGLE, TEST_TUBE_SPREAD, 45);
	}
}

centrifuge();