Jump to content
UltiMaker Community of 3D Printing Experts

How much play is normal in the bearing of the extruder burred gear?


gdog

Recommended Posts

Posted (edited) · How much play is normal in the bearing of the extruder burred gear?

Servicing one today that was a mess.  It had been serviced before (as the adjustment screw was on top of the housing due to incorrect reassemble) but the fact is it was grinding filament and I expect fixing the tensioner adjustment screw will help but it still seemed to have a lot of slop in the bearing.  Like almost 0.5 mm of play side-to-side. 

 

EDIT:  ***  JUST TO ADD, I assume this is the original gear, and the machine has about 2800 print hours on it  / 2400 ft of material extruded.  So would that be still inside the normal service life on the original extruder assembly?

 

Also, is it possible to save the burred gear and just replace the bearing?  It doesn't look particularly serviceable but you never know... 

 

 

Edited by gdog
  • Link to post
    Share on other sites

    Posted · How much play is normal in the bearing of the extruder burred gear?

    So you are talking about the 2 gears in the UM2+ feeder?  I believe 0.5mm of play is too much.  Not sure.

     

    @fbrc8-erin - what do you think?  Does he need new feeder gears?  (his profile says he has a UM2+ ext).

     

     

    As far as 2800 hours and 2400 meters of filamnt - it's common for those numbers to be similar - that's a lot but we've seen printers hit 10,000 meters.  You might want to change the belts now.  Definitely change the teflon part if you haven't done that (the teflon part in the head - the white part.  Called sometimes an "isolator" I think?)  That should be changed every 500-1000 hours.

  • Link to post
    Share on other sites

    Posted (edited) · How much play is normal in the bearing of the extruder burred gear?

    I just rebuilt the head / hot end - new block, isolator, teflon thing + nozzle.  With that done, attempted to get a test print out. (This machine was a salvage project).  The first go was a fail - the material failed to load and instead a very nice crecent was chewed in my filament as soon as it got to the print head.  So I'm thinking, "Yeah, that extruder is worn out", but then I inspect and the teeth marks in the strand up to the crecent look Goldilocks, so I try again.  This time, I disconnected the gear with the release lever and push manually through the extruder till material was coming out.  At that point, I reingage the gear, and it worked fine.  Did the mini-cal test print.  The bottom layers came out beautifully.  But at the first infill stages, it got ugly like blobby and stringy.  I ended up slowing down to 50% print speed and it seemed to help.  But when I tried to remove from the print bed, the thing broke on those first few infill layers. 

     

    Good news - the circles and shapes pretty much came out prefect - there was no x-y shift or x/y belt/motor skipping which is what the person who gave away the machine was complaining about.  I am going to post some pictures in a bit.  I am thinking basically that the failure to load had something to do with the Bowden tube, but I'm not sure.  It seems like maybe the filament was getting stuck on the lip of the teflon thingy after exiting the bowden, but I assure you I use all the force appropriate to cram that bowden tube all the way down in the print head. 

     

    EDIT - ADD PICTURES (1) chewed filament that failed to enter nozzle on "change filament"... got hung up and just litterally chewed a bit out of it in <1 second. (2)   MINI-CAL (broken)

    IMG_20220128_232107975.jpg

    IMG_20220128_232019837_HDR.jpg

    IMG_20220128_231955513_HDR.jpg

    Edited by gdog
  • Link to post
    Share on other sites

    Posted · How much play is normal in the bearing of the extruder burred gear?

    I haven't used the "insert filament" option on my UM2 printers in years.  I always slide it in manually.  That feature is only needed for the original "non plus" feeders.

     

    Always cut the filament to a point.  Two cuts should do it.  Not at 45 degrees but much steeper angle.  That will help the filament find the hole in the teflon.

     

    • 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

      • UltiMaker Cura 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 30 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
         
         
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
         
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
         
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.
         

         
        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
         
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 22 replies
    ×
    ×
    • Create New...