Top layers not filling in
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I have bottom layers set to 3 and top layers set to 4
The bottom layers print as smooth as butter, real nice, no problems
Top layers, the print head seems to almost be spitting out filament and not filling properly.
and
Any ideas what may be causing this
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Take a look at matterhackers troubleshooting guide and simplify3d specifically addresses this. It looks like under extrusion caused by either too low a temp or flow rate.