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enter image description here

What is the easiest way to add/extrude an edge loop around the hole in the first image to make it like the second image?

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In addition to using bevel (@RobinBetts answer), you can also use Inset.

In face selection select all your geometry minus the ring of faces inside the hole, then inset I. This gives you loops on both sides of the hole.

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  • $\begingroup$ Counter-intuitive, and ingeneous. You learn something every day... $\endgroup$ – Robin Betts Dec 30 '18 at 13:43
  • $\begingroup$ this works brilliantly, thx $\endgroup$ – rwana Dec 31 '18 at 3:57
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Select the loop, and CtrlB bevel it, with 2 segments, and a profile of 1. This will give you a bevel with the original loop intact, the new loop you want, flush to the outer surface, and one you may or may not want around the recess. You can CtrlX dissolve the inner one away, if you like.

You can follow this up with a GG slide on the new loop(s), using E to make the slide parallel to one or other of the surrounding loops, and F to decide which.

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  • $\begingroup$ Thank you, this and the solution posted by Jaroslav Jerryno Novotny work great. $\endgroup$ – rwana Dec 31 '18 at 3:59
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Scale the hole up using Shift+Y (image one), select its two edge loops. Use extrude + scale to the inside (image two) and bridge the loops. The second scale is the ScaleOne-1. Scaling up remember to keep the loop within your face. Hole scaled up

E+S

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  • $\begingroup$ I don't really see why this got a downvote.. it's straightforward, and precise? Strictly, it's not very general, I suppose? It needs the pipe to be straight? $\endgroup$ – Robin Betts Dec 31 '18 at 11:24
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Select your hole (the cylindrical edge loop) completly and press E and S to scale. Press Shift + Z once or twice to contrain the scale axis correctly. Then type in the amount of scale you want and remember it. Next press Numpad + and scale by 1 divided by your remembered scale. You may need to take out an calculator for that. Hope this workflow helps you

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