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36 bright red LEDs, 12 precision resistors valued at 270 Ohms.\r\nPrints seamlessly without support structures.\r\nNo ATtiny microcontroller? Simply connect the three LEDs in series directly to a 12V power source.\r\n\r\nATtiny sketch:\r\n\r\nconstant L0 = 0;constant L1 = 1;constant L2 = 2;constant L3 = 3;constant L4 = 4; int d=100;\r\nvoid setup(){\r\npinMode(L0, OUTPUT);pinMode(L1, OUTPUT);pinMode(L2, OUTPUT);pinMode(L3, OUTPUT);\r\npinMode(L4, OUTPUT);\r\n}\r\nvoid loop(){\r\ndigitalWrite(L4, HIGH);\r\ndigitalWrite(L0, HIGH);delay(d);digitalWrite(L0, LOW);\r\ndigitalWrite(L1, HIGH);delay(d);digitalWrite(L1, LOW);\r\ndigitalWrite(L2, HIGH);delay(d);digitalWrite(L2, LOW);\r\ndigitalWrite(L3, HIGH);delay(d);digitalWrite(L3, LOW);\r\n}