Thin wall head movement behaviour

[drmaestro]

Hi,

When I am trying to print very thin objects (like a calibration cylinder or a fan shroud) I can observe an odd printing behaviour. In the case of the fan shroud, instead of printing 2 continous full circles for the inner and outer perimeter, Simplify 3D chooses to make one circle clockwise for one perimeter, immediately followed by the other circle anticlockwise for the other perimeter. In the case of a single walled calibration cylinder, it shows the same behaviour, even if I choose spiral mode. Why would spiral mode choose to make non-continous movements? The only way to fix it is to choose the merge all outlines into a single solid model option but then you loose some details like holes.

Is this a bug? Is this a prblem with the objects maybe?

Thanks.

[brian442]

You can only use the spiral vase mode if your model only requires a single outline. If you were printing something like a hollow cylinder, the software would normally print 2 outlines (one for the outer wall, and one for the inner wall). So if that's the case, like you said, you have to use the merge all outlines option so that it becomes a solid cylinder that would have otherwise only had one outline.

[drmaestro]

Thanks for the answer. I understand that limitation about the spiral vase mode. However, the movement behaviour I have explained in my original post happens also when I print in normal mode for the objects I have described.

[brian442]

Even in normal mode, it is still going to trace around the outside and the inside of the cylinder if you have a hollow part. So you can still use the trick above even in normal mode, just enable "merge all outlines", set infill to 0%, perimeters to 1, and top/bottom solid layers to zero.