Jump to content
UltiMaker Community of 3D Printing Experts

Burned Heated Bed Connector


Recommended Posts

Posted (edited) · Burned Heated Bed Connector

I suspected there was something funny when my UM2 (now UM2+) smelled a bit different.

But when I saw some magic smoke coming out of the wires at the back of the heated bed, and then a little sparking, my suspicions were confirmed. Something bad was going down. On close inspection, the big heater power wires were charred to carbon, and on removing the build-plate and bed assembly, the main brown wire (#2) was melted into the connector. The connector is toast - literally.

It has made me think, because we've had a few Temp Sense Error: BED alerts over the years, which get better when you poke the bed wires: wondering if the wires were loose, or whether the connector is up to handling the current (this is a 2013 machine, I recall seeing comments to that effect). I inspected them when we did the UM2+ upgrade in the summer, and they seemed ok then.

I unsoldered the connector, and unfortunately the connector came away with the two thermistor pads - I think the solder wasn't melted properly because the heated bed was acting as a heat-sink, and perhaps they had degraded with heat. Not a total disaster: I think I can solder a wire to the stub ends of the tracks.

But I need to reconnect the four wires to the board. So my questions are:

1. Does anyone know where I can source a replacement connector, please? I've been digging around on RS and Digikey, but I can't see one like it.


2. Are there any standard hacks for this situation? I'm wondering about soldering new wires to the bed PCB, clamping/restraining them to the bed using the existing connector mount screws, and then using a separate connector to affix the supply wires - is that feasible?


3. Am I an idiot who needs to buy a new heated bed?

Edited by Guest
  • Link to post
    Share on other sites

    Posted · Burned Heated Bed Connector

    Hey Torgeir, thanks for that ... yep, I was looking at those, but I was rather hoping to find the exact connector - that way, I won't have to do too much improvisation around mounting and fixing it. I've become a bit cautious after the smoke and sparks :-)



  • Link to post
    Share on other sites

    Posted (edited) · Burned Heated Bed Connector

    If your in the US FBRC8 has the bed parts. I had the same exact thing happen to me and they sent me a new bed and connectors. They told me UM had problems with this so they changed the connection type to push pins.

    This is what my connector looked like when I hit it with the FLIR. I was noticing a smell for a few weeks that smelt like wet dog and couldnt find the source until I started seeing smoke. IMG_0963.JPG.thumb.jpeg.f10af9f25caa88937d608c0da6fd0d2b.jpeg


    Edited by Guest
  • Link to post
    Share on other sites

    Posted · Burned Heated Bed Connector

    Just realized I never posted the outcome here. This is what happened:


    I tried hard to fit ... well, anything ... to the bed. I couldn't source the right connector, as it's supplied with the bed as a complete unit. But the pads that I was trying to connect to were badly frazzled anyway, and gradually the whole area disintegrated; there was nothing stable to solder anything to. Problem was that the whole bed acted as a massive heat-sink, and I couldn't inject enough local heat to control the solder. The thermistor started falling off too...


    I contacted Creat3D - our original vendor - who were helpful, but in the end I just bought another bed from them, which was quite expensive but was a quick and non-bodged solution. The new bed has a different - far better - style of connector, so I'm glad I did it. The cost is filed under "reasonable wear and tear".



  • 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
        • 31 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
        • 23 replies
    • Create New...