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Top of 3D printed Item not printing correctly


We have 2 newly purchased Polar3D printers.  I am emailing because the 3D printer is not coming out with precise printed items.  For example, we tested it out with a cube.  The bottom of the cube printed fine, but the top was full of air pockets and not completed.  This has happened to every item printed so far.  How can I get the top of items to be aligned and fully printed? 


Hello, we have the same problem. We have increased temperature to 210 º C, and we have cleaned extrusor, but it dosn't work. The bottom is fine, but the top is always terrible. Please help !!!


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