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What I am trying to do is similar to what was asked here: Set edge as axis for surface rotation

I am hoping to use an object's edge for rotation, but instead of simply the one object rotating around that point, it'd be a bunch of stl's I've imported together: enter image description here

enter image description here

What I'm hoping to do is duplicate everything in that tetrahedron object, rotate the duplicate along one edge like this:

enter image description here

to build a stack of them, like this: which I would then print. Any help? enter image description here

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Here is a way to do it:

  • Select the edge that you want as axis.
  • Press ctrl alt spacebar to record this axis as one of your Transform Orientation axis. Keep this axis selected in the Transform Orientation dropdown menu.
  • Put your 3D Cursor on the selected edge with a shift S > Cursor To Selected.
  • Select 3D Cursor in the Pivot dropdown menu
  • Rotate your pyramid with R Y Y (or X X, depending of its name in the new Orientation Axis) and press the amount of degrees.
  • To delete the orientation axis you don't need any more, in the 3D view press N to get the right menu and go to the Transform Orientations tab.

enter image description here

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  • $\begingroup$ Worked amazing! Thank you! Only comment is I think it should be shift+s, not ctrl s. At least on my computer ctrl s kept trying to save. Maybe mine is set up wrong. $\endgroup$ – Joe Crozier Jul 27 '18 at 13:43
  • $\begingroup$ you're right ;) $\endgroup$ – moonboots Jul 27 '18 at 13:45

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