Ender 3 all in one rear electronics case with 2 40mm fans in the back

by Michal_G Oct 30, 2019
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Do you have 12V fans for the hotend and part cooling too?
How do you wire them?

No, for the hotend I have regular 24V fans

Hi do you have a high res or one i can zoom in and read the red text next to the YYG-2 Relay etc? in the download there is just small res ones.

Also ive tried to remix your right side box to add the cable chain mount to the left of the fan where you have the cutout for the cable, - but i cant for the life of me figure it out lol - This is what im trying to add if you look at this Thingverse


Thanks in advance!

Ender 3 electronics case with 40mm Fan, additional Buck Converter Mounts and Cable Chain Mount
by 7FM

YYG-2 text you can see e.g. here: https://images-na.ssl-images-amazon.com/images/I/6106IrBCDeL._SL1001_.jpg. You can also just Google "YYG-2" images.

Regarding the chain, that's the tough one. In the position where the chain is normally attached I have the fan. And there is no other place where to place the fan. You could attach the chain about 40mm to the left, but then it would not be aligned with the bed I assume. The only solution I can see is to fix the chain at the top lid, but you would need to check the minimum bend radius of the chain.

Thanks for that link, wasnt sure if i had the right YYG-2 as i ended up finding 5v/12v/24v ones. I got the 5V one and have just powered it all up and the Pi starts up find the two DC-DC converters are fine one is set to 5v the other 12v (for when i add led's)

Only thing thats happeneing now is when its powered up it goes to start the SKR the light on the relay closest to the pi comes on for a few seconds then goes off - is there a setting i have to put in the PI / octoprint so once the pi's booted up it tells the GPIO14 (Pin 8) which has the blue wite connected to the IN connection of the YYG-2 Relay to send an output so the replay knows to turn on?

I havent connected the boards to the printer yet just wanted to check it was all ok before i started to take the ender 3 apart.

only other thing was I couldnt get the octo print to connect to wifi, but ive got it sorted now and proved it works ok with stock Mainboard find.

And for the HIGH/LOW LEVEL TRIGGER i have it set to High.

The YYG-2 I purcahsed was this one https://www.amazon.co.uk/gp/product/B07TWH7FWW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Thanks in advance.

P.S Image atatched is the case with boards wired up as i have them

Wiring looks OK. The trigger can be high or low, depending what you want the default state after power on to be (i.e. without Octoprint interfering). I also use HIGH and get the same behavior after start up. It's not ideal, but tolerable.

For the control of the relay with Octoprint, you need a plugin, e.g PSU Control (https://plugins.octoprint.org/plugins/psucontrol/), which is easy to setup. There are tons of examples online how you set it up and use it (e.g. https://youtu.be/ozCqqlPJ3a0?t=274)

Is YYG-2 DC24V?

I used 5V version. Not sure if the 24V version can be powered by 24V, but triggered with only 5V

Hey. Really digging this. Ordered some fuses myself when I saw this, definitely a good idea.
Can you explain how you use the 30A relay in a bit more depth, please?

What do you want to know? One of the images is the schematics. For controlling I use Octoprint PSU control plugin. Very easy to setup.

I think I got it. The part I didn't quite get is why would you be switching the motherboard and leave the PSU running, which is what in reality happens, but you don't notice it. A little current still flows through the PSU from the wall to keep the octoprint working 24/7? Or do you turn off the PSU entirely when you're done with printing?
Also one thing I still don't understand on the schematics is why is the relay connected to the Out of the DC converter?

You are right. The PSU, both DC/DC and RaspberryPi is always powered, 24/7. But this "standby" mode takes only about 5W. This allows to remotely access Raspberry Pi and switch the printer ON using the relay.
The relay is connected to the 5V DC output to power it. The digital output of RPi can provide only about 20mA, which would not be enough to turn the relay on.

Gotcha. I understand everything now. Thanks for taking your time to clarify this for me:)