#BRAVA 21 PRINTER CUT ZIP#

Make sure to add zip ties on the cable as I did in the picture. If you're building this I'm sure you have a 3D printer so it shouldn't be a problem. The STL files are available here and also on Thingiverse. I have designed this simple enclosure that will house relay module and neatly route the cord. There is exposed mains voltage on the board. Don't even think about plugging the power cord in without any sort of cover. Last but not least is to add cover for the relay module. you can also check if the GPIO pin voltage is changing. If not check the wiring and make sure the relay module is working. From the web interface turn the power on and off couple of times and you should hear the relay click each time. Leave the power cord unplugged and simply have the relay module connected to the pi. Now would be a good time to see if you can control the relay. The remaining setting can be left at default. For example, if you're using GPIO21 you'll enter 40 because GPIO21 is on pin 40. Do NOT enter the number after the GPIO but the number of the pin. If you used any other pins then here you'll select which pin is being used as the signal for the relay. If you used the pins 3,4 and 6 on your pi as I suggested then for the On/Off GPIO Pin enter 3. Choose switching method to GPIO pin and GPIO mode to BOARD. Go to settings and on the left-hand side select the new PSU control option. We are not done yet, few things need to be set up. It will take few minutes and afterward you'll be prompted to restart your Octoprint.ДЄfter the reboot, the plugin is installed and you'll see lightning bolt icon on the top bar. At this point, you should see PSU control plugin submitted by Shawn Bruce. You'll see a list of plugins but you need to select the get more button on the bottom.

Next, click the settings icon and choose the plugin manager on the left-hand side. Open the Octoprint in your browser and log in.

#BRAVA 21 PRINTER CUT SOFTWARE#

I've used NC which means the printer is only on when the relay is energized.ДЇortunately installing the software is really easy as we'll be using a pre-existing plugin. NC stands for normally closed and NO for normally open. One must be connected to the common pin(labeled COM) and the other to either the NC or NO pin. These two ends need to be screwed in a terminal on the relay board. Cut the brown(black if it's US plug) wire right in the middle and strip both ends. Make sure their insulation is ok if not you'll need to get a new power cord. After removing the insulation you'll see 3 wires inside. Simple make a shallow cut and then rip the insulation. All of my cuts were very shallow to assure I wouldn't damage any of the wires inside.

I've used x acto knife to remove the insulation. Make sure the power cord is unplugged from the wall and remove about 5cm / 2inch of insulation about 20cm / 8inch from the end that plugs into the printer. Or you can simply follow the instructions and replace the power cord with your DC power cable which is even better. If you have power brick instead they usually have power cord like this as well. It might look slightly different but that's fine. It should be the one shown in the picture. I'm not responsible for any injury or damage you may cause.ДЇirst, we need the power cord for the 3D printer. Since you'll be working with the mains voltage you need to be really careful. In order to turn the printer on or off we'll be using a relay to control the mains voltage. Once the relay is working you can move on. I'd suggest checking this instructable which talks about it in step 6. It's just a matter of add single resistor. If nothing happens you need to make a slight modification. You should hear click and the COM and NO pins should be shorted. Power the relay board with 5V and use 3V3 signal to trigger it. Lastly, We'll make a cable connecting the raspberry pi and the relay module.Д«efore building anything I'd suggest making checking if the relay module will work with 3V3. You'll also need a power cord that will be cut but you can use the one your printer came with.

If you want to build one yourself too I'd suggest checking out this instructable. I'll be building my own module but that's just because I'm still waiting for the ones I ordered to arrive. The ones used for Arduino will work just fine. If you don't you can check the official guide here. I assume you already have your Octoprint set up and running as I won't be covering any of that here.

Brava 21 printer cut