Jump to content

UM2+ Z-axis leveling issue


arodgers
Go to solution Solved by Dustin,

Recommended Posts

Posted · UM2+ Z-axis leveling issue

Honestly not sure right now whether this is a hardware or software issue. I have an old UM2+ that is used by my high school students. This one has gone through the wars -- preCovid students thought it needed oil and oiled it so much that it fried the motherboard, among other things. So we have a new motherboard, with an old printer, at this point.


The printer is screaming when trying to home. X and Y axes move fine; Z axis finds the lower bound without an issue but moves up and up and crashes into the nozzle while whining/shrieking. I haven't tested the length of time that it'll keep doing this (it seems bad for the printer!) but pushing down on the print bed or turning the printer off stops the noise and stops the printer from trying to continue to push up.


On searching for Z-axis problems, it appears that the z-end-stop is at the base of the printer and actually functioning fine, and that there may be a software issue that the printer isn't sure of its upper bound.
 

Printer was restored to factory default to try to fix this issue; does not seem to have helped. Students were supposed to flash updated firmware; I'm not sure whether they successfully did or not. Printer says that the current version is DEV (which implies to me that they were unsuccessful).

 

I'd love some help to decide what to try next!

  • Link to post
    Share on other sites

    Posted · UM2+ Z-axis leveling issue

    Flashing firmware fixed it! Yay!

     

    New issue (of course) - I started printing a Benchy, and found that the printer was working fine in the X and Z direction now, but the Y seems to be having trouble. Does this look like a belt-tightening issue?

    PXL_20230418_003647001.jpg

    • Like 1
    Link to post
    Share on other sites

    Posted · UM2+ Z-axis leveling issue

    loose belts?  No.  Loose pulleys?  Maybe.

     

    First if this is an old printer try oiling the rods.  Just one drop on each of the 6 (not 2, not 4, 6) rods in the gantry.    Push the head around to see if resistance is much higher in one axis versus the other.  They should be the same.

     

    Your issue is missed steps or slipping pulley.  The first is usually caused by unusually high friction.  The second is when a pulley came loose.  So check that next.

     

    It's almost always the pulley on the stepper.  So if you have the long hex driver that came with the printer (black and green handle) then you can do it without removing the stepper covers.  Push the head around until you see the setscrew deep in there between the 2 sides of the short belt.  Tighten the hell out of that set screw?  It only takes two screws to remove that metal cover that hides the stepper motors.  That's your backup plan.

     

    Tighten the other 5 set screws for the slipping (Y) axis as well but it's usually the one on the stepper and you have to tighten it so much the hex tool twists a bit.  Scary tight.

  • Link to post
    Share on other sites

    Posted · UM2+ Z-axis leveling issue

    Looks like you should probably just go thru the whole suite of recommended maintenance on this machine to make sure everything is working correctly..

    Guides can be found here: https://support.makerbot.com/s/article/1667410778200
    There is also guides with pictures that cover the steps recommended by gr5 🙂

    • Like 1
    Link to post
    Share on other sites

    Posted · UM2+ Z-axis leveling issue

    I don't see anything about how to tighten the set screws (aka grub screws) in that list.  Probably because it's usually not an issue but...   this symptom where you are losing Y position is most often caused by the grub screws thing (but check friction first).

    • Like 1
    Link to post
    Share on other sites

    Posted · UM2+ Z-axis leveling issue
    11 hours ago, gr5 said:

    I don't see anything about how to tighten the set screws (aka grub screws) in that list.  Probably because it's usually not an issue but...   this symptom where you are losing Y position is most often caused by the grub screws thing (but check friction first).

    Check for play on the Ultimaker 2+ axles covers this: https://support.makerbot.com/s/article/1667411289738

  • Link to post
    Share on other sites

    Posted · UM2+ Z-axis leveling issue

    Oh yeah.  Sort of.  But it's usually the pulley on the motor that needs it's set screw tightened because that one experiences the most torque (close second is the other pulley on the short belt).

    • Like 1
    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

      • Introducing the UltiMaker Factor 4
        We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
          • Like
        • 2 replies
      • UltiMaker Cura 5.7 stable released
        Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more. 
         
          • Like
        • 26 replies
    ×
    ×
    • Create New...