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HP Designjet Color 3D Support Jamming

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HP Designjet Color 3D
I have a HP DesignJet Colour 3D that I'm having issues with and wondered if anybody could help?
The machine has been sat for quite a while, but it did used to work fine. I have managed to get it working and printing again, but during printing whilst it swaps between the model and the support material, the support material seems to come back up the extruder tip and bunch at the top, causing a loss of extrusion. I clear it out, set it off again and it extrudes fine, but then after a short time the same thing happens. I've tried a new tip in it too and it still happens. Does anybody know what may be causing the issue?
Thanks in advance.
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usually first thing to check if the support reel is under warranty, this will be 1 year after the manufacturing date that appears on the reel.


another point that you can check is: if you take support material and bend it? Does it break easily? , this will mean that you need to change it with a new one.





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