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punpunm
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This is a common problem and easy to fix.

The problem is that the nozzle never leaves the small area at the top and so the plastic never has a chance to cool down. The best and simplest solution unfortunately is to print something else nearby that is taller or the same height. I would personally probably print 2 sharks. Alternatively you can put a tall cylinder next to the shark that is slightly taller.

Be careful to look at it in the slicer and make sure that it prints both parts at the same time and not one part followed by the other. You can force this with a checkbox somewhere in the new cura menus or you can go to machine settings and set gantry height to 0.

 

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    By the way - the fins of your shark need support. I strongly recommend meshmixer:

    http://www.extrudable.me/2013/12/28/meshmixer-2-0-best-newcomer-in-a-supporting-role/

    pay particular attention to how to rotate your part in the "annoyances & limitaions" section and also note that

    there is a small error where he set layer height to "0.5" mm and it should be the layer height you print at e.g.

    .2 or .1mm.

     

     

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    Thank you for your answer, I have use meshmixer for my shark, because I have found that some part have not supported by cura(0.5x scale).

    I will try to print double shark for my printing.

     

    By the way - the fins of your shark need support. I strongly recommend meshmixer:

    http://www.extrudable.me/2013/12/28/meshmixer-2-0-best-newcomer-in-a-supporting-role/

    pay particular attention to how to rotate your part in the "annoyances & limitaions" section and also note that

    there is a small error where he set layer height to "0.5" mm and it should be the layer height you print at e.g.

    .2 or .1mm.

     

     

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