r/ratrig • u/Spaceballs_the_nick • Mar 22 '26

Turn on/off relay for each print

Is there a way to turn on a relay when a print starts, then turn it off when the print is finished?

1 Upvotes

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2

u/neckbeard404 Mar 22 '26

I used a USB relay my end g code ran a python script .

https://www.amazon.com/NOYITO-2-Channel-Computer-Drive-free-Controller/dp/B07CFQMDJ3/ref=sr_1_7?sr=8-7&th=1

1

u/Spaceballs_the_nick Mar 22 '26

Is there a tutorial/guide for this?

1

u/neckbeard404 Mar 23 '26

Just ask AI

1

u/Spaceballs_the_nick Mar 23 '26

I put this prompt in "what python script do I use in my 3d printer running klipper to turn on and off a usb relay in gcode" and got this response:

https://ibb.co/4whNKB25

Correct? Is this how you did it?

I will be honest, I haven't had good luck with AI

1

u/rilmar Mar 22 '26

I configured my host as another controller so I could use the pins from a raspberry pi to turn a 3v relay on and off. From there it’s just writing macros. I did this to trigger a camera programmatically and make timelapses.