Jump to content
Ultimaker Community of 3D Printing Experts

UM2 J20 or J14 for print voltage ? UM2 V2 Board Cooling

Recommended Posts

Has anyone successfully used either of these jacks for powering a fan ( J20 or J14 ) ?

I'd like to cool the board and am printing a duct to aid in board cooling. I'd prefer to use J20 Fan 19-24V but the only reference I can find is "bad things happen" when you connect to this jack. Nothing specific though ? I know J14 and J15 are being used for laser diodes, I'd just like to run a simple fan, possibly only while the hot end is engaged.

I have both a 12V and a 24V of the same dimensions available to use.

This is what I'm attempting.

Fan orientation:


Fan duct:





Share this post

Link to post
Share on other sites

Did you ever get this working?

This is what i did:

I hooked the 24v 1.5 amp blower fan to the j20 (fan 18-24v) plug.

I printed the exact same fan duct , I hooked up the blower fan... i plug in my ultimaker and the blower fan doesn't turn on. I left it on for about 1 minute and still it never turned on. From what i read that 24v plug is supposedly always on if the utimaker is on, so why isn't it working?

In fact it smells like it the fan may be cooked ?

Shouldn't the blower fan turn on the second the ultimaker is turned on?


I figured this out, the fan or the board (unsure which) had the polarity wrong. I had to splice the fan wire and connect the positive to the negative wire and visa versa , because the controller had the + and neg on opposite sides.

I now have it up and working but man almost had a heartattack thought i roasted my board at first.

Edited by Guest

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
      • 130 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!