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Cura Not Outlining correct

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The model's walls are too thin.

 

You have several options.  One is to check "print thin walls" but how thin are your walls?  For example a typical nozzle is 0.4mm wide.  If the walls are thinner than that well the cookie cutter won't be strong enough anyway - it will be as bad as using paper for a cookie cutter.

 

I recommend 1mm thick walls for a cookie cutter.

 

A better option is probably to make the model solid with a top and bottom and then in cura tell it to do no top/bottom layers thickness 0 and zero infill and then cura can do it in one pass instead of two (prints twice as fast) and you can control the thickness of the cookie cutter in cura.  Set line width and wall width to 0.6 for a thick strong cookie cutter or 0.4 for a thinner cookie cutter.

 

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