Jump to content
UltiMaker Community of 3D Printing Experts

Aux power out - suicide?

Recommended Posts

Posted · Aux power out - suicide?

I am running a water cooled head on my UM, and I want to find a way of cutting the power to the pump once the print has stopped, for example if I run overnight.

Ideally I need a pin that can switch a MOSFET on the 12V line as an aux-out for the pump. It needs about 500mA so its more than could run from the existing fan outputs.

I know Daid did a suicide implementation a while ago which could do it by shutting the whole machine down, but I can't find this now, and I don't think it made it into the main Marlin build.

Any thoughts?




  • Link to post
    Share on other sites

    Posted · Aux power out - suicide?


    Yes I have a 2A switching regulator in place of the 7812, so no problem there.

    Is there an easy way of making the heater2 output active only when printing?


  • Link to post
    Share on other sites

    Posted · Aux power out - suicide?

    The heater2 output is coupled to the heater2 temperature sensor.

    If you set the heater2 to 100°C target temperature, but the temperature reading never reaches 100°C, then the output will always be switched on :)

    Of course you need a firmware that enables the heater2 output. And you need to solder in some fixed resistors on the heater2 temperature input so that it will always read the same temperature.

    -> When the print is done, target temperature will be set to 0°C so the heater will switch off. Make sure heater2 temperature doesn't read below zero degrees ;)


  • Link to post
    Share on other sites

    Posted · Aux power out - suicide?

    You can also use the M42 command to control the 2nd/3th heater output if there is only a single-extruder extruder and no heated bed configured.


  • Link to post
    Share on other sites

    Posted · Aux power out - suicide?

    Sounds good, but I do have a heated bed... I'll look up M42 though.


  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • UltiMaker Cura 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 28 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.

        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 22 replies
    • Create New...