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Bridging is not triggered on hollowed models

Posted: Tue Nov 05, 2019 2:58 pm
by SteveIsHeer
When I take a solid model and set infill to 0, the bridging settings are not applied to the top layers of the model. A good example is to simply take a solid 20x20x20 cube, set infill to 0, any number of perimeters. The top layer prints like the rest of the print without bridging settings applied. This is a problem when the top layer has a larger area than this test cube.

Re: Bridging is not triggered on hollowed models

Posted: Tue Nov 05, 2019 4:52 pm
by dkightley
You've answered your own question. A solid 20x20x20 cube is not hollow.

Edit the solid cube in a CAD package so it is hollow....and its hollow. And bridging will then apply on the downward facing surface INSIDE the hollow shape.

Setting the printed infill to zero does not magically make the object hollow!

Re: Bridging is not triggered on hollowed models

Posted: Thu Nov 07, 2019 5:35 pm
by SteveIsHeer
dkightley wrote:
Tue Nov 05, 2019 4:52 pm
You've answered your own question. A solid 20x20x20 cube is not hollow.

Edit the solid cube in a CAD package so it is hollow....and its hollow. And bridging will then apply on the downward facing surface INSIDE the hollow shape.

Setting the printed infill to zero does not magically make the object hollow!
That is my point! The slicer has made it hollow therefore should treat it as such. This is a feature missing in the slicing process. By having the slicer hollow it out, it should process it as hollow. It's not a big issue for a small item like the above mentioned cube but if the model is larger, without applying bridging settings, it would fail to create the top surface. The idea of putting supports in via the cross section tool isn't acceptable.