Why is my BB now printing like this?

Discussion in 'Calibration, Help, and Troubleshooting' started by fpex, Sep 24, 2016.

  1. fpex

    fpex Well-Known Member

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    [​IMG]

    So far this problems has showed up only with three (two different brands), but I have a fear it is just a generic thing. Same filament printed wonderfully on my other printers ...
     
  2. Kanedias

    Kanedias Well-Known Member

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    I'd suspect a partial clog or try a little hotter. I know it should make sense that if it worked well at 190 on one printer it would be the same on another but it can't hurt to try. Looking at the gaps on the flat layer there it looks like it's not flowing correctly.
     
  3. fpex

    fpex Well-Known Member

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    I am already at 210C .... later today i might dismount the nozzle and put another one.
     
  4. Greg Holloway

    Greg Holloway Administrator
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    If you're printing PLA the recommended temp is 220 for the V6.

    Also check your steps-per-mm for the extruder.
     
  5. fpex

    fpex Well-Known Member

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    I just changed the nozzle and it now prints well. It seems that something got so attached to it and even at high temp it did not come out.
    Unbelievable, first time it happens to me.I guess I have been changing to often materials that some residue made a mess.

    PS: I am printing already at 220
     
    #5 fpex, Sep 24, 2016
    Last edited: Sep 24, 2016
  6. fpex

    fpex Well-Known Member

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    I have changed nozzle and it seemed to be gone. After one week I have the same problem now with XT .... I tried anything from 235 to 265. No difference
     
  7. fpex

    fpex Well-Known Member

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    Well, one photos shows the problem and one the probably cause.
    Lost two nozzle and, heater block, and so on in one week. This is not nice.[​IMG]
    [​IMG]
     
  8. Duncan Chivers

    Duncan Chivers Well-Known Member

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    Looks a lot like an issue I had. The nozzle wasn't quite close enough to the heat break inside the block, so the melted filament was able to seep out (it was the heat break that was loose, not the nozzle). For me it caused a total blockage in the end, and I was getting prints that just failed part way through, and the printer just continued to do air-printing.
     
  9. fpex

    fpex Well-Known Member

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    Well, mine was rather tight ... but it looks like the parts are not well connecting.
     
  10. Duncan Chivers

    Duncan Chivers Well-Known Member

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    When you say tight, do you mean when you screw it in? - you are attaching the nozzle whilst the block is hot, yes? If not you might not be screwing it in far enough.
     
  11. fpex

    fpex Well-Known Member

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    I tighten it at 280 deg ... I guess hot enough, especially for my hands!
     
  12. Duncan Chivers

    Duncan Chivers Well-Known Member

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    Probably even hotter than I use (about 200).

    It's an odd one - I ended up completely disassembling everything from the heat sink downwards and starting again. It definitely looks like it's 'leaking' though to me.
     
  13. Jasons_BigBox

    Jasons_BigBox Well-Known Member

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    You should be using higher temperatures than that when tightening the nozzle. The assembly instructions say 285deg C.

    http://wiki.e3d-online.com/wiki/E3D-v6_Assembly#HotSide

    The whole point of the assembly instructions is to get the nozzle/heatbreak joint tight at a higher than operating temperature. That means that when running at normal printing temperature there will be a thermal contraction in the block that keeps any gap from opening up. If you only tighten at a lower temperature then expansion in the block will mean that connection will be loose.
     
    mike01hu likes this.
  14. Duncan Chivers

    Duncan Chivers Well-Known Member

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    That makes total sense, thanks. Duly noted and I'll do that from now on. :)
     
  15. Jasons_BigBox

    Jasons_BigBox Well-Known Member

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    Thank goodness for that, it's been a long week.....
     
  16. Duncan Chivers

    Duncan Chivers Well-Known Member

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    :D
     

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