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Broken AA Core tab


gardnert
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Posted · Broken AA Core tab

Hey everyone!

My institution recently purchased a UM3 and a scanner on grant money for an upcoming project. I've been 3D printing at home for a couple of years now (prusa i3), and since we're a pretty small college, I've been tasked with a lot of setup/answering questions: something I don't mind at all.

Yesterday I had a print fail (I'm thinking retraction settings, but that's neither here nor there). I was going to pull the AA core out to check for clogs, and to change out the filament. I ran the core swap process (an absolute dream coming from reprap land), the head moved to its spot and I took it out: easy peasy. But when it came time to put it back in, the clear tab at the top (polycarbonate?) snapped, right at the two thinnest spots.

I did nothing different and applied the same pressure when I was setting up the printer and removing said core: has this happened to anyone else? I know UM hasn't released the schematics yet, but has anyone printed replacement parts (yet)?

Thanks for y'alls input. So far this has been a super great machine to work with (and I've been using Cura as my own slicer for years, well done!)

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    Posted · Broken AA Core tab

    Hi and welcome!

    Nice you enjoy this machine. About the core plaatic broken, I don't see anything wrong here on your side, you should be able to get a replacement from your UM reseller.

    Unless someone sees it otherwise?

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    Posted · Broken AA Core tab

    Hi, gardnert, that definitely doesn't look good. Since you're in the US, reach out to our team at Support@fbrc8.com.

     

    Thanks! Our original vendor pointed us to you, small world! The return/replacement process is already underway. Thanks for the heads up!

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    • 3 months later...
    Posted · Broken AA Core tab

    Mine broke around the screw, the local dealer 'Creative tools' here in Halmstad Sweden say they don't have it as spare part, just the hole print core.

     

    that is correct, you'd replace the whole printcore. replacing this 1 part is a total pain and it's better to just replace the core.

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    Posted · Broken AA Core tab

    Agreed. You wouldn't want to take it apart, and getting a whole new print core only sounds like a better deal, no? ;)

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    Posted (edited) · Broken AA Core tab

    Hello,

    You can print a new one!

    The file is on GitHub

    https://github.com/Ultimaker/Ultimaker3

    file is: 2129-F

    STEP to transform into STL or you can download from below!

    Original Tab is Polycarbonate (PC). Print it in CPE or in CPE+ and it won't stress crack anymore and it will be almost transparent.

    PC  stress-cracks under stress when in contact with oil...

     

    Enjoy!

    IMG_5261.jpg

    IMG_5260.jpg

    2129-F (repaired).stl

    Edited by ludo06
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    Posted (edited) · Broken AA Core tab
    On 9/19/2017 at 1:33 PM, SandervG said:

    Agreed. You wouldn't want to take it apart, and getting a whole new print core only sounds like a better deal, no? ;)

     

    Shame on you for this comment. It is wrong in so many ways (economically, environmentally, customer-friendlines,...). But yes, you can also behave like apple and let the customers pay for your bad design choices.

     

    @ludo06

    Thanks for the upload. I have already 3 cracked tabs and replaced them with 3D printed ABS versions.

     

    I have modified the original tab (see the attachments for the stl) to be more rigid with more material in the screw head area by switching to a countersunk screw hole. I have also removed the chamfer at the top for better printability.

    If somebody wants to use it, you need to also order a M2.5x40 screw countersunk screw. 

     

    Tip: Print the tab with the 0.25 nozzle and use ABS. Dont use nylon or similar soft material. It is too soft and will bend under constant load from the spring.

    IMG_20210723_155334.jpg

    IMG_20210723_155312.jpg

    2129-F_optimized.stl

    printcore_new.JPG

    printcore.JPG

    Edited by mkaj2019
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    Posted · Broken AA Core tab

    Great tips!

     

    Has anyone tried to print the print core frame yet?  I have refurbished an old core that needed a new nozzle, but its frame was also warped.  Debating about options there.

     

    Thanks again!

    John

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    Posted · Broken AA Core tab
    On 7/27/2021 at 8:43 PM, JohnInOttawa said:

    Great tips!

     

    Has anyone tried to print the print core frame yet?  I have refurbished an old core that needed a new nozzle, but its frame was also warped.  Debating about options there.

     

    Thanks again!

    John

    I haven't tried it. How warped is this frame, can you bend it back?

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