LED Lighting System for Aluminum Mendel
by OpenSourceClassroom, published
This LED light system is perfect for illuminating the printer bed to allow for close and careful examination of your model while it is being printed. There are (6) 3V, 20mA LEDs that are angled to shine down directly on the bed. This addition was carefully designed to confine with the sleek concept of the Aluminum Mendel and still keep all wires and components inside the frame area. Wires are tucked into the grooves of the aluminum extrusions and the on/off switch is located in the back right corner (does not interfere with the y-axis bed travel). Having the LED light system attached to the frame instead of on the extruder keeps from adding excessive wires and weight the the extruder carriage (which can hinder print quality and increase vibrations while printing).
Print LED Brackets and Backs. Solder LEDs in the holders with a 150 ohm resistor in series and run wires to back right corner. Then glue the backs together and mount brackets to the upright frame posts. The LED switch plate was printed with two different colors to give it a little spice and to highlight possibilities of multiple colored prints. Given the two circuits of (3) 3V LED's and the resistor, these can be hooked up in parallel to the single-pull double-throw switch. This switch can then be wired directly into the 12V power supply without further changes to the circuit. Plus, having LED lights will use very little power and truly help you see the details of the object that you are printing.