Jump to content
Ultimaker Community of 3D Printing Experts
  • Sign Up

Burned connector on main board

Recommended Posts

Posted (edited) · Burned connector on main board

Hello everyone,

I have an Ultimaker 2 that I purchased around 4 years ago that stopped heating the build plate. I verified that the build plate was heating by manually powering the plate with a power supply. I removed the plate to access the board and found that the conector where the build plate is connected was completely burned as you can see from the image. Does anyone know why this could have happened? 


Edited by dpelaez

Share this post

Link to post
Share on other sites
Posted · Burned connector on main board

That's caused by a loose wire.  power, measured in watts is I*I*R where R is the resistance and I is the current.  Normally the resistance of the heater is about 4 ohms (roughly) and the voltage is 24V and so the current through the heater is about 6 amps.


In the wire to the heater the resistance is probably less than 0.1 ohm but even if it was that high you would get 36*.1 or 3.6 watts distributed through the whole wire.  Not a big deal.  But if you get even 1 ohm of resistance at that connector that's 36 watts going into that tiny spot and it gets quite hot.


Even though it looks like crap it probably still works fine.  Ideally you want to remove all corosion off of all metal parts that touch the wire.  So if you have a tiny file you could slide it in and out of the hole where the wiring goes in to clean it out a bit and reinsert the wires.  This time clamp it down TIGHT.


Share this post

Link to post
Share on other sites
Posted · Burned connector on main board

You should not operate the board in such a condition. It's a high risk for a fire as further short cuts are likely due to the decreased resistance of the plastic (burned plastic gets conductive).

At least you should replace the connector with a new one if the pcb itself is undamaged.

Share this post

Link to post
Share on other sites
Posted · Burned connector on main board

I had a few terminal blocks laying around that have the same pitch as the one soldered on the board and I replaced the terminal block. Printer is back up and working.

Thanks for your replies.



  • Like 1

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

    • Talking additive | The 3D printing podcast
      Why should we be the only ones asking questions? Join us and ask Jabil all your questions on September 22nd 5pm CET
        • Like
      • 2 replies
    • Ultimaker masterclass: Optimizing your Ultimaker Cura workflow
      Save your seat for either broadcast on September 23.
      What will you learn?
      · Best practices for iterative print preparation and every lesson you should learn from each print
      · The right way to use per-object settings and when they are most useful
      · Easy-to-use resources for anyone who wants to develop their own printer definitions, plugins, or print profiles
      · How to optimize print profile settings and whether to “keep” or “discard” changes
      · When is the right time to export your drawing from CAD? (Based on Ultimaker Cura’s surprising power as 3D control software)
      · And a whole lot more tips and tricks!
      How can I join?
      This free masterclass will take place twice:
      1. 11am CEST (5pm SGT, 5am EDT)
      2. 5pm CEST (11am EDT, 8am PDT, 11pm SGT)
        • Like
      • 0 replies
    • Do you use 3D printing at work? Let us know
      It doesn't matter if you are using 1 Ultimaker or 10, there is inspiration in everything. We're looking for ...
      • 1 reply
  • Create New...