![]() ![]() Another thing you need to consider is intersecting objects. And now, I have a solid cube with a whole in the middle. Also in this case, I want to make sure to create caps. If you want to keep all of the edges together, you need to increase the maximum angle in many cases, above 90 degrees, and make sure preserve groups is on. Now, there are few things you want to watch out for. ![]() In this case, for instance, I can enable the extrude tool and extrude all of those polygons out. Now, there are different solutions for this depending on your model. That tells me that this is a boundary edge that's causing this object to not be watertight. And now you can see that this edge where I deleted the polygon is green. We'll go ahead, and for now, turn everything off except for boundary edges. Just choose Modeling, and then find the mesh checking tab. An easy way to get to the mesh checker is by hitting Shift M, or you can access it from the mode menu of the attribute manager. You can identify issues with the water-tightness of your objects using Cinema 4D's Mesh Checker. And it's also not going to be able to tell what's the inside of the object versus the outside. There's no thickness here, so there is no room for it to lay down plastic. But if I go in here and select this top polygon and delete it, what I have now is a cube with walls that are a single polygon thick. If we look at, say, a simple cube, this is a watertight mesh. All that basically means is that your object has to be able to exist in the real world. The first thing that I'm sure you've heard is that your 3D meshes need to be watertight in order to be 3D printable. So with that in mind, let's take a look at some of the key geometry issues that can throw 3D printers for a loop, and the tools that will help you identify and fix those within Cinema 4D. But in general, keeping an eye on some specific geometry concerns will help to ensure that your model comes out of the 3D print process looking like you intended rather than the way that the slicer interpreted your geometry. Some slicers are much more forgiving than others. Commercial services and slicers have tools to automatically fix your bad geometry. But in my experience, the workflow is a lot more forgiving than that. One of the most intimidating things for me about 3D printing was the idea that my geometry had to be perfect.
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