Power Supply Cover

thingiverse

<h4>Summary</h4> Another power supply cover with a place holder for solid state relay and XT60 connectors is created. The original Folger 2020 3D printer design has the power supply (S-260-12) hard wired to the power plug, which turns on the extruder fan whenever plugged in. The power supply fan also runs for no reason. There's nothing wrong with this solution, but I like to make things more complicated. My goal is to control the power supply only during printing and cooling down using an orange Pi (same as Raspberry Pi). The Ramps / Arduino is powered by a USB connector, which allows remote turning on and off of the power supply via a 5V DC output. The output activates the solid state relay, allowing 120VAC (or 220VAC) to reach the power supply. <h4>Parts</h4> - IEC Power connector. The most common and cost-effective option available on eBay and Amazon. - Solid State Relay (25A). Yes, 25A is overkill, but these are the cheapest solid state relays available. They also work with only 3VDC input if required. - XT60 connectors. These connectors should handle 60 Amps, but my maximum load is about 15 A. <h4>Wiring</h4> If you're not comfortable handling wiring of 120-220 VAC, please don't do this project. <h5>Ramps </h5> On my Ramps board, the header to control the relay is near the main power connectors. I connected the ps-on to the negative terminal of the relay and the Vcc connector to the positive terminal on the relay. The ps-on is grounded when on, as it was intended for an ATX power supply. <h5>Power Connector</h5> Follow the picture for the suggested power connect connection on the back. Instead of connecting the brown wire to the power supply, connect it to the AC side of the replay and add a pigtail from the relay to the power supply. <h4>Slicer Modifications</h4> I had to modify the slicer start and end gcodes to turn the power on and off. I also added a cool down temperature to delay the turn of the power supply, allowing the fans to cool the motors and extruder. Note that I had to add the M19, M104, M109 codes as the slicer program would put them before the power on (M80) code. *Start gcode* <code><pre>M80 ; turn on power supply M190 S[first_layer_bed_temperature] M104 S[first_layer_temperature] G28 ; home all axes G1 Z5 F5000 ; lift nozzle M109; wait for temperature to reach </code></pre> *End gcode* <code><pre>M106 255 ; turn fan back on M104 S0 ; turn off temperature G28 X0 ; home X axis M84 ; disable motors M140 S20 M109 S100; wait for temperature to reach 100C M140 S0; turn off temperature M107 ; fans off M81 ; turn off power supply </code></pre> <h4>Firmware</h4> The firmware must support the switching of the power switch. I am using Marlin firmware and had to add the below to the configuration.h and download to the Arduino. <code>#define POWER_SUPPLY 1</code> Print took Approx. 2h