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How can I add holes at specific offsets from the edges of my object (as per picture below)? Using edge loops, I believe I can measure from the middle of the object, but it would be much easier to measure from the edges. Is that possible? Tks!

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All sorts of ways, making your own measuring sticks, temporary edges or loose vertices to snap to, etc, etc, but here's an example for putting holes in a tube at measured Z positions using the cursor...

  • Make a section with a hole, and in edit mode with all selected, ShiftS > 'Cursor to Selected':

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  • ShiftD duplicate the section.
  • In the Properties Region, 3D Cursor panel, set the Cursor to the desired Z
  • The duplicate section should be selected... ShiftS again > 'Selection to Cursor (Offset)

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  • Rinse, repeat ...
  • CtrlE > 'Bridge Edge Loops' to fill the gaps

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If you mean from other edges, you can place the cursor at the median of any selection of elements in Edit Mode, and you can enter arithmetic expressions in its location fields.. so if the cursor was at, say, 1.414, you can just add a "-0.5" to the end of the existing value to get your offset.

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    $\begingroup$ Many thanks. That's very helpful. In my case, picking up on your earlier suggestion, I greated a loose vertex, made the vertex a parent of an array of cylinders, and then through a boolean operation, used the cylinder to make holes in my cube object. $\endgroup$ – Crowdpleasr Jul 30 '19 at 4:05
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    $\begingroup$ @Crowdpleasr There you go.. I wouldn't have thought of that.. I would usually use an Empty that way... and that reminds me, I forgot to mention Delta Transforms in the Object tab.. so many ways ... $\endgroup$ – Robin Betts Jul 30 '19 at 5:26

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