Update! If you have problem with 5V relay I've made tutorial on how to make it work on 3.3V kzfaq.info/get/bejne/pp2noN1y36q8XYU.html

What an awesome idea! I didn't even know octoprint had that feature. I just integrated mine into home assistant using a sonoff and for the camera I use an old android phone with IP webcam but now that you showed us that feature I know I'll be using it for something in the future.

Thanks man works a treat!! Funny thing is my pi won't run it on a 5v output, chucked it into a 3v output and worked beautiful!

Nice. A few days ago I thought that would be a nice idea to be able to shut the printer on off via octoprint and mentally drafted exactly this solution. Glad someone did it 3 years ago and I don't have to think further. Great job.

Thanks for helping out the community. I configure mine so that my screen, board and pi are connected to a 5.1v uninterruptible power source. My first setup used an HP DPS-600dp power supply in which certain pins needed to be jumped to power it on. I connected that directly to my servo pin on my board (almost any other pins could be programed via firmware). I had to configure the PS_ON pin and enable ps control in firmware. This eliminated the need for a relay on that setup. I could turn it on via the lcd screen and octoprint too. Just use the power on plugin or as I do, type M80 via terminal to turn it on and M81 to turn it off. I also had to add a relay to the PS to cut power to the fan when it isn't running full power. The 5vsb out powered everything else. On my second build, I used two HP DPS-1200w in series for 24v. Unfortunately this power supply still overheats if the fan is off even if it isn't providing full power on only Standby voltage. I then had to get a relay that works off of 2.5v as my xyz max ports have a pull up resistor and only outputs under 3v. It was a 5v relay but had a circuitry that allows it to be activated very low. This is getting too long...... I can turn it on via the tft screen and via octoprint too....

That's a great idea to use octoprint for controller when you already have one. Will replicate this one for sure!

Well done. This video has made this project understandable for me. Thanks!

This worked amazing. Thank you so much for the clear video and great idea.

Thank you making this video. The relay conversion to 3.3 signal in helped also. I tried to use GPIO02 as it was closer to 5v and ground but found it unresponsive. I guess the script does not declare the use of the pin, but changed it to GPIO only pin, then used pin number not GPIO address and worked fine.

I like it and your professional video. When I make mine I will use a drill to make the cable holes and I will pull the cables out of the same hole for the switched power lead. Depending on space remaining I will use 2 cable ties each and when I cut the power lead I will position the cable somewhere adjacent to the printer to keep the cabling neat. Top-notch job!!.

This is exactly what I was looking for, figured this was how you'd do it, except I'm wondering why you chose to splice into the power wire opposed to just tapping in behind the power connector and enclosing your relay inside your PSU's connection cover. That way you can still flip the switch to completely kill everything drawing from the wall outlet opposed to having to unplug it.

Interesting video, thanks for the time and effort you put into making it! Unfortunately for me,my rPi is powered from the printer PSU via a buck converter, but I wll find another use for this great and very helpful tip! Keep up the good works!

All the people saying wifi plug - I think you are missing the point of this video. It's using OctoPi and therefore all within the one piece of hardware and webapp. Nice video thanks

Great Tutorial I love it!

Another wi fi plug user here they are ten bucks and simple to use as long as you can get WiFi signal you are good to go I do appreciate what this guy is trying to do though

I was a little confused by the diagrams as none of them seem to match my setup (with the exception of the GPIOs on the rPi) but with some googling figured it out, thanks! :)

Great tutorial. Thank you!

Thank you. I was looking for something similar. This of course is assuming to have the raspberry always powered from another supply

very good... thank you for showing how to set this up..... cool

I'm never going to do this, but it was still super interesting!

i did this mod with my 3d printed enclosure. now i just wish i can find a plugin to control the led lights with relays now also

Great tutorial!

Tried making this work for 2 days and finaly got it. I was using a 5v relay and a 5v pin, but couldnt get the relay to unswitch. Just use a 3.3v pin instead of the 5v and it will work fine.

Very nice ! Liked and subscribed.

Great video!

Hello, do you turn on and off printer also automatically, also than manually? In particular I'm searching for a similar solution to turn on case's fan on starting a printing job, and turn off when a printing job is done.

You should mention that in large parts of the world, the mains plug is not coded and can plug in either way. This can be a hazard, if you use a single relais, if you switch on and of the neutral wire, instead of the L1. If you swith the neutral, the power is still delivered to your printer, so there s still a live wire inside your printer! It does not turn on, because the N wire is not connected. But it will schock you either way if you touch it. Use a 2 relais board and switch N and L with the two relais, controlled by one GPIO.

Hi Gyro. Great tutorial. I am having a problem where I cannot connect to Octoprint when the printer is turned off. My raspberry pi has its own power supply and is on, but because the printer is off I can not get a connection to turn the printer on remotely. Any suggestions?

Hi, great tutorial. I couldn't find the exact current the 3.3V pin can withstand. Can it supply the 70mA for the relay? Even on the RPI zero 2 w?

I would like to have my printer set up so that I can turn the printer on with either the normal on/off switch on the printer or the pi. Could I do that by connecting the NO terminal to ones side of the printers on/off switch and the COM terminal to the other? Would that cause an issue if both the relay and printer switch were closed at the same time?

You say hook up the printer power wires to Com and NC (Normally Closed), but I think it should be NO (Normally Open), that way, if the raspberry pi turns of it fails safe and does not turn on your printer! I've already ordered my relay, hoping to do something like this soon.

my raspberry pi for my octoprint setup uses the adafruit touchscreen so my gpio header is used for the touchscreen. Is there a way that I can still do this while keeping my touchscreen?

You could have also added in a Power Loss detector as well, for a complete solution.

Hot it working now, i have to use the end pin and middle, i did not know because there is no pin layoit on my relay, but bottom pin is Common open and middle is closed top one is common closed. So i use common ooen en closed now, and it is fine, so not the two outer pins wher the brown is going in as in yoir explanation

Is 10a enough for a large printer like the CR-10?

If I use one of those cheep china relays. How many Amps 24V from the PSU can it handle? I have a 24V 17A PSU

hi there are you using the Mini ?

"hopefully nothing blows up and nobody dies" :D

Is there a way for me to block the pi from powering the mainboard? Im setting up a relay to power on the printer from the pi and all is good so far. My issue is that darn undervoltage to the printer when it is not turned on. I want to leave the pi running all the time and only turn on/off the printer when needed. Thanks for the tutorial btw great vid.

I like your axent.

great idea, I'm planning to adapt this idea to make use of a delayed relay board so i can shutdown a raspbery pi and turn off the printer from an octoprint touchscreen

Great tutorial thanks, some day we will have a robot to load filament, remove the model and clean the bed, until then the odd trip to the basement is still needed LOL.

The relay I picked up has 5v for power - that works fine - but the 'N1' connector will automatically trip the relay - it is a Robojax 5v relay that triggers low. I'm not having any luck...

Thanks for much for making this. It's great information and I'd like to take on the project but I have a question. The Amazon link goes to the 3.3V relay. Is that right? I believe the video referenced the 5V GPIO?

What if GPIO output is only 1v? I cannot seem to get this to work. Assuming that I need to do something more but not sure.

Hi. Can i power off the printer at the end of job with this thing?

Im assuming you can turn on and off multiple printers using a different GPIO pin for each relay?

hi there. im using orange pi lite board, sucessfully installed octoprint and the required plugin. The thing is, when i choose switch method, it only shows "system command" and "G-code command". There´s no option for GPIO... any help?

Great video! I need to know how do you make the diagrams on 1:48 2:55 and 3:15 ?? It looks awesome.

Woww!! Inspired by your channel😀

Hi I made this and it's awesome! Is there a way to combine it with the automatic shutdown plugin from octoprint? that after finished a print, the PSU turn off the printer and octo shuts down too?

thank you

Thank you Gyro for this great tutorial. I have a quick question. Is there a way to set this up with the Pi Zero W?

Hi all. I'm developing a plugin (or implementing another one) that shut down the printer automatically when it reaches a certain temperature, without the need to open the app or the browser. Does anybody know which file checks this on octoprint?

This is great but I assume this means that power must be on the pi at all times Yes,? so while the printer might be off the pi will still be on albeit it not doing much. as this video is a year or more old would it be a safer bet now just to use a wifi socket and turn the power off to the pi and the printer and turn them on via wifi when you want, that way the pi is not running even in background when the printer is off? Am I correct? thanks Neil

Thanks for sharing :-) Interesting Video :-)

Thanks for video in 30 minutes is ready in my ender 3!! , i thin create a video but in spanish of this , you have a problem if link your references and instructable?

How about when the PI outputs 5 volts on the USB and is connected to the printer? The controller may be supplied with power by the PI via the USB cable.

If I were to use the 5V pin, would I not have to worry about the whole 3.5v thing?

Done the mod like on your yt film, got a 3.3v relay and vcc to 3.3v ground to ground and the signal pin to the gio pin that represents no3, configured it in psu config on octoprint like in your yt film saved the lot, can hear the relais clikcking and see the green led go on and off, (my printer is power bij a on off switch wich is turned on) but still no controle to turn my printer on and off. It is a anet A6. What am i missing here

Why didn't you used the relay with the 24v dc curent instead of ac ? Also doesn't it draw more than 10A, the psu has 14A

isnt it easier to make it a relay for the power switch?

Awesome tutorial, I have ordered relays and patiently waiting for them to arrive. I the meantime I'm thinking how will that work with my Ender 3. I have Pine64 with Octoprint that is connected to a printer via usb cable and when pine is operational it gives power to printer display and probably other functions on the printer even if printer PSU is not powered. How can I avoid powering printer trough usb w/o PSU?

This was two years ago is there a better method now?

Gcode controled?

hey! really enjoyed your video, helped me a lot while setting this up but now i´m facing a problem: the gpio pin doesnt switch at all, i tried wiring my relay module the other way around (power supply on COM and NO) so i could check if the relay switches and as soon as i power on my pi it switches, but when i try to switch per PSU control plugin it doesnt do anything.

Thanks for the video, short and informative. Just a question: how do you manage to keep the LCD screen of the printer off while it is connected to the Raspberry Pi? Or isn't it connected in the video demonstration?

Do you know if PSU Control works also with OrangePi Zero? If not, do you know where I can find the plugin and how to install manually? Thanks

Hi So the raspberry Pi still needs to be powered by an external source

hi gyro im totaly new im running 3.5 display on PI can i just use same pins for display twice for relay if i extend them from other side? thanx

OWWWW...Amazing !

Thanks !!!

Hi, very nice video! @ 1.26 I see a webpage where you can calculate the resistor for the transistor... which page is that? thank you very much!

If you realised your relay board: be careful to insulation distances and clearance distance on main power (on video is the brown wire).

Most of these relay boards work with 3.3 vcc.

Thanks for the video, I have built this and it works really well. But after switching the printer on and off a few times to check that it works, I then do a print and I am finding that after about an hour print that the relay contacts have fused together and I no longer can switch the relay. This has happened to two devices so far. Relay is rated at 10A 250VAC. Thoughts?

Couldn't you take it even further, and draw 220v from the cable to power the Pi, and make an enclosure for all the components? Essentially you'd be left with a power cable coming in/out of the box, and a USB-cable for connection.

Great video and solution. I recently purchased a CR-10S and just received my Raspberry Pi so I can print using Octo Print. Question I have is upon plugin in my Raspberry Pi to the printers USB port the printers screen turns on even with the power switch turned off. Besides removing the 5VDC pin on the USB cable is there another way I can resolve this issue?

Relay case stl file please.

i've seen using methods like this above using the relay to completely remove power to power supply. This is no good if your powering your pi from said power supply. so how about just cutting the power from the power supply to the 3d printers board. this would leave the power supply on but the printer off. for example on my ender 3 pro i would just have the relay cut power going to the xt60 connector?

Is there a way to have this cut the power at the end of a print?

Do you have a thingiverse for the 3d print case? Great Job!

A bit of a loss here. I leave my printer on all the time just like my on standby TV. As far I know only the LCD and maybe a few other components like the transformer use only a very small fraction the power.

I find that if my printer is off but connected via USB to the pi, that the pi powers the display and circuits of my Ender 3. I'm not sure that's a good thing to do. Therefore I would need a second relay to disconnect the USB power to my printer

Very nice explanation! I would like to know something: My raspberry is powered on the 3d printer PSU, when I turn of the printer it will also turns off the Pi. Is it OK for the Raspberry to turns off like this?

I'm setting up a windows octoprint hub with 5 printers and now I am wondering how I can so this on a windows octoprint server...

this is great, working fine, the only thing is that the bolt icon is green when the printer is off, and when i press the bolt , printer turns on. how can i sync it to the true state of the printer ?

This probably will never be responded to but do you have any concerns using a 5A relay? I have a 120V, 10A relay for my Ender 3 and I want to make sure I’m not going to burn the house down when running this for a long term. The math says I’m only pulling about 3A but I’m not sure how reliable these small parts are.

Absolutely awesome. Now hook it up to a smoke/heat detector to auto-shut off for you. Another project idea: Command the printer to prep the bed for printing :) Seriously though - its an awesome idea. Well explained, love your humour. Thank you. Nicholas

I do the same thing with a wifi plug off Amazon. I use it to turn it off from anywhere. With a camera I can see when it is done printing and give it 10 minutes to cool down and then shut it off

very nice, the raspberry pi should be plugged in all the time right?

i connected everything as you told, after setting up the gpio pin the relay klick and turned off the circuit. but the power button does nothing, which means that the relay stays off all the time

Let's say I have 3 printers connected to my OctoPi, Can I do this device 3 times and turn them on/off separately just like you do here?

hi, can this solution be applied when the printer is switched off automatically after printing?

Excuse me what 3D printer I use in the video

I don't know why my on/off function doesn't work well. If i put the cables in NC configuration I can turn off but not turn on then, and If I put in NO I can't turn off. I try connecting 1 relay with 24v positive Common and with 2 realys one for 24 positive and another one for the negative. Any idea?

What about putting the relay in between the PSU and the printer instead of in between mains and the PSU? That would allow one to power the Pi from the printer and still turn it on and off - However you’d have the PSU turned on constantly then...

could've put the relay with the main board, no?

i have a 40 amp psu there is no problem whit a 10 amp relay?

Wow.. Awesome..