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1

Definitely the speed will be worse after adding holes (or the quality otherwise, if object's skin is printed fast), though some filament savings may appear. But regarding "object stability": because adding holes will normally cause the slower printing (because of "skin structures" around holes), then walls might get bit stronger or have ...


5

Holes in vertical walls will make it take significantly more time to print, not less. Rather than being able to make a continuous path around the box on each layer, keeping the print head at the desired speed the whole time, the printer will have to run around each connected component of the layer separately, slowing down, retracting, speeding up to travel, ...


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By far the easiest program to use is tinkercad and its free. https://www.tinkercad.com/


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