Jump to content
Ultimaker Community of 3D Printing Experts

Burned connector on main board

Recommended Posts

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

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

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

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 | a new interface
      We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance. 
        • Like
      • 85 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 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!