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Magnetic closing system UM5 printhead to weak for BB08?


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Posted (edited) · Magnetic closing system UM5 printhead to weak for BB08?

Today i almost had a nasty experience, after i changed my nozzles to AA08 and BB08. When the print started the printhead fell open, and lucky for me i checked during the printbed heatup cyclus, otherwise it would be a certain crash!!

I experimented with all my print cores (i have 8 pieces, but only 1 BB08), and it seems that only the BB08 makes this happen. When lowering the nozzle, It pushes against the silicone piece (which i also changed) Core seems to be ok, can't see anything wrong with it.

At the moment i take no chance, and put a elastic around the printhead, to prevent it from opening during printing, and creating a major problem. Not an elegant solution, but i already saw someone else do this.

Anybody any tips?

Found this: https://www.thingiverse.com/thing:3319232/comments

Seems to be the safe solution at this moment? Hello Ultimaker?

Edited by RudydG
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    Posted · Magnetic closing system UM5 printhead to weak for BB08?

    are you sure you mounted the silicon pad correctly?  maybe share a photo or even better video?

    Can you simulate by manually moving the BB core up and down (manually with the side lever) and will the head then pop open?

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    Posted · Magnetic closing system UM5 printhead to weak for BB08?
    8 hours ago, ultiarjan said:

    are you sure you mounted the silicon pad correctly?  maybe share a photo or even better video?

    Can you simulate by manually moving the BB core up and down (manually with the side lever) and will the head then pop open?

    100% sure i mounted the new (and remounted the old on, which was'nt end of life)

    And yes, it popped open when i manualy lowered BB down.

     

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    Posted (edited) · Magnetic closing system UM5 printhead to weak for BB08?

    Thank you Smithy, the one on Thingiverse is quite lose indeed.

    Gives me some reassurance 😉

    Edited by RudydG
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    Posted · Magnetic closing system UM5 printhead to weak for BB08?

    I just loaded the Thingiverse one in Fusion260 and cut 1mm out, so it is basically the same thing, just shorter 🙂 

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