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tomato-icn

Holes in the objects

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You are asking the printer to print in mid air. While that can work on small areas with controlled speed (called bridging), expecting it to work on these models is asking too much for this type of print process.

 

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Also, using 'duplicate outlines' doesn't make sense if you don't have an infill. Instead, just set the layerheight at 0.04 - 0.05 mm.

I don't know why you wan't 0% infill but if it is to spare on filament.. then don't do this. You're trhowing away more plastic then you spare with this method. If you use 10% infill in combination with a top/bottom height of atleast 5x the layerheight, it doesn't cost that much more filament and will give you much better prints without gaps!

 

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Set the bottom/top thickness to be non-zero. In the new 13.05 Cura beta, you can turn off top and bottom thickness separately. You're probably also going to need to print with either infill, or some sort of support in the middle to help hold up the top. The slope is so gentle that the loops don't touch one another.

If you really have to have it totally hollow, then the only options are going to be to print slower and cooler, and with even thinner layer height, in order to get as many passes as possible over the troublesome area.

Also I'd turn off duplicate outlines. It isn't helping here - it just prints the exact same thing twice, at half the height. If you're going to take the hit to print twice as many passes, then you *want* them to be different in this case, so that the slopes get smoothed out better. Duplicate outlines is a kludge that causes problems in a lot of cases, and it's only benefit is allowing you to print infill half as often as you print perimeters. Since you aren't printing infill here, it's of no real benefit.

 

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To get the part hollow *and* to have no holes in the top is going to be very difficult. But of all the suggestions the one closest to what you need is use the new cura beta, set top thickness only.

Also, I agree, never ever use the "skin" feature. Better to slice half as thick layers. This will be the same speed and will make the holes smaller (half the size). They will still be there but smaller. Each time you cut layer height in half the holes will get twice as small but it will take twice as long to print.

But there is some point where you are "printing on thin air" and that just doesn't work well.

 

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If you use infill 10%, or even 5%, and no bottom layer, you should be able to still pour some gypsum in there for some weight. Or you can drill out some of the infill after the print is done.

 

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You could also slice with top and bottom fill and remove the first X layers from the GCode.

 

But only the infill part... or else add gcode to fake the z-coordinate, otherwise you'll be printing all the upper layers in mid air. :-)

 

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