I am trying to cut three orthogonal, through holes in a sphere that will go along the three axes. In order to do it, I inserted three cylinders as in the image below (the cylinders were selected for better viewing):
I used the non-destructive bool tool (in the “Add-ons”) to make the boolean difference between the objects. The holes on Y and Z axes came out right, as seen in the next two images:
However, the hole on the X axis didn’t come through right: instead of a through hole, the hole ends with an artifact at the edge of the holes on Y and Z axes, blocking the hole as seen in the next image:
The boolean was used by selecting all the objects at once (the sphere was selected last, of course). I thought it may be an artifact introduced by the Bool Tool. So, I tried a different approach: using the Boolean modifier. However, even when using Boolean modifiers one by one for each cylinder, the artifact is there.
I don’t understand what is going on - I’m a novice with Blender. I would appreciate it if someone would teach me the reason(s) behind the artifact, and - if it is possible obtain the three orthogonal through holes - how to make the holes. If it is possible, I’d like to keep the sphere drilling non-destructive, in case the hole diameters might have to be changed at a later time.