I'm working on some modeling for a jewelry box and I'm doing most of the modeling with primitives. I frequently end up doing something like the following: I want a bar with a bulb in the middle.
So I create a box: 48x10x10. Then I create a cylinder: 20x20x10. Both of these are at the origin. So this puts the cylinder right in the middle of the box and the top/bottom faces of both the box and cylinder are on the same plane.
At this point if you try to add a boolean modifier to one and select the other as the target; then you get some . . . odd results. Sometimes the initial one will work but then future boolean modifiers will cause crazy stuff.
I understand from previous posts that this has something to do with them sharing a face/edge/etc. and lovely divide by zero errors or something.
Is there a good way to do this type of operation? I just want these to objects to be one single one so that when I make another cylinder later I can cut a hole out of the middle of it.
In the past I've gotten around this by just not joining them at all and letting them overlap. Then when I pull the model into Cura for 3D printing Cura doesn't care about overlapping items or shared walls etc. But this is less than ideal for the modeling portion because any time I want to move the thing I have to make sure to select all the individual parts that comprise my "unit".
Now I am going to put two boolean modifiers on the horizontal bar. The first one is a "union" with the cylinder. The second is a difference with the vertical bar. This is the result. You can see by the highlighted wires and the odd interior faces that something strange is going on.