Heated Bed Connector Failure

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seaton
Posts: 291
Joined: Tue May 14, 2013 9:04 am
Location: Bunbury, Western Australia
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Heated Bed Connector Failure

Post by seaton »

Just a warning people

I've been running a number of prints with nylon over the last few days with the heated bed at 90Dec, basically nearly 100% duty cycle. These prints have been approx 10 hours long and have run overnight. Tonight while kicking off my latest for the evening, luckily I was right next to the printer as it was going. Started to smell something and investigated, this is the result.

This is a Version 2 upgraded to V3 with new heated bed, but original V2 electronics. I'd say that the connectors on the PCB are underrated for the current of the V3 heater, when on 100% duty cycle.

Wires down near terminal were very hot and potentially a fire risk.

Luckily i caught it in time and no damage to the PCB. I managed to change the connector with a similar one to get me though the print as I had a deadline tomorrow morning. However I lowered bed temperature to 70Deg to give it a bit of a duty cycle so not on 100%. I just hope I don't get any curling. (or a fire)
IMG_3942.JPG
Stephen...

Felix 2.0 -> Felix 3.0 dual
Simplify3D Slicer, Kisslicer
Have you added your Felix to the Map? http://goo.gl/maps/HajnZ

http://blog.strobotics.com.au

Dreide
Posts: 176
Joined: Sun Sep 29, 2013 12:32 am
Location: Lausanne, Switzerland

Post by Dreide »

Thanks for having shared this.
Not sure whether the connectors are really underrated. With all the vibrations going on, it might also well be that the screws become loose over time or the wires "settle" into place after first assembly. I just tightened all the screws and they were certainly not as tight anymore as they have been right after I assembled the printer.
Felix 2.0->3.0dual * Repetier (host+firmware) * KISSlicer Pro, Simplify3D * Cubify Design

seaton
Posts: 291
Joined: Tue May 14, 2013 9:04 am
Location: Bunbury, Western Australia
Contact:

Post by seaton »

Dreide wrote:Thanks for having shared this.
Not sure whether the connectors are really underrated. With all the vibrations going on, it might also well be that the screws become loose over time or the wires "settle" into place after first assembly. I just tightened all the screws and they were certainly not as tight anymore as they have been right after I assembled the printer.
Yes I tend to agree with you, I was pondering this same thought last night in bed and more than likely the case. That said I think I'll move to a direct plug type connector especially for the heated bed where it could happen again, its easy forgotten to go and re-check screw tightness and as I do a lot of unattended prints I don't want to risk it happening again, especially when I'm not around.

I have some left over silicon flex for a quad copter I build that will handle the current and will probably solder in directly to the board with a rated push connector for easy disconnection if needed. This should prevent it happening again.

Thankfully I finished the print no problems this morning, cut it fine with the customer, but print and house were still intact :)
Stephen...

Felix 2.0 -> Felix 3.0 dual
Simplify3D Slicer, Kisslicer
Have you added your Felix to the Map? http://goo.gl/maps/HajnZ

http://blog.strobotics.com.au

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