Jump to content

UMO temperature noise SOLVED


Recommended Posts

Posted (edited) · UMO temperature noise SOLVED


This is my first post.

I have had an Ultimaker Original for a year and an Ultimaker 2 for 2 months.

On the UMO I have experienced noise from the amplifier pcb on the printhead.

It resulted in arbitrary "fishnet" layers due to too low temperature caused by temperature noise.

The cause of the problem is an unstable supply voltage for the operational amplifier.

When you have a pcb with many IC's and low inductive supply planes, then a 100nF decoupling capacitor for each IC do a good job.

But the pcb on the printhead sits in the end of approx 1m cable with self inductance.

I soldered a 1uF ceramic capacitor on top of the existing decoupling capacitor, and have not had this problem since.

IMHO the thermo couple solution is superior to a PTxxx solution.


Edited by Guest
  • Like 1
Link to post
Share on other sites

Posted · UMO temperature noise SOLVED

I emailed a link to this thread to the hardware guy who actually designed the PCB.


Thanks, it was a temporary error coming from time to time, had to discard the print each time it occurred. Hope it can spare others from from this annoying error.

  • Link to post
    Share on other sites

    Posted · UMO temperature noise SOLVED


    Could the temperature noise be related to the item described in fan-speed-influences-reading-temperature-hot-end (and links)?

    Could you post a picture indicating where you soldered the capacitor?


    I can't say, sometimes you are fighting more than one error at a time.

    But adding noise near the amplifier can be the problem.

    What I can say is, that when operated within specifications, parts from Analog Devices do an excellent job. It is one of the most skilled producers of analog IC's.

    I have added a picture showing the pcb on the UMO printhead, where an extra 1uF ceramic capacitor has been added upon the original C1.

    On my UMO I have seen no temperature noise since this addition.

  • 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

      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 48 replies
    • Create New...