Jump to content
Ultimaker Community of 3D Printing Experts
mbef

Burned Heated Bed Connector

Recommended Posts

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.

OR

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?

OR

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

Edited by Guest

Share this post


Link to post
Share on other sites

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 :-)

Cheers,

Mbef

Share this post


Link to post
Share on other sites

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

IMG_0963.JPG.thumb.jpeg.f10af9f25caa88937d608c0da6fd0d2b.jpeg

Edited by Guest

Share this post


Link to post
Share on other sites

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".

 

 

Share this post


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

    • Taking Advantage of DfAM
      This is a statement that’s often made about AM/3DP. I'll focus on the way DfAM can take advantage of some of the unique capabilities that AM and 3DP have to offer. I personally think that the use of AM/3DP for light-weighting is one of it’s most exciting possibilities and one that could play a key part in the sustainability of design and manufacturing in the future.
        • Like
      • 3 replies
×

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!