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I'm attempting to make a combination wrench. The hole is supposed to be hexagonal, but I can't figure out how to sharpen the edges without causing pinching on the outer side of the wrench when I use a subdivision modifier. Anyone have any ideas on how to do this?

I also tried beveling the inner lines of the ring that caused an artifact:

Edit: actually, a bit simpler method. First, the destructive version:

• Create a 6 vertices circle.


• Subdivide it once.


• Extrude it inwards.


• Make its external edge loop a circle with W > Looptools > Circle.


• Extrude it up on the Z axis.


• Give it a Bevel modifier / Angle mode, with an Angle low enough to smooth the internal vertical edges.


• Smooth with a Subdivision Surface modifier and a Smooth Shading.

The non-destructive version:

• Create a 6 vertices circle.


• Subdivide it once.


• Give it a Solidify modifier.


• Create a 12 vertices circle.


• Extrude inwards and merge it on its center.


• Give it a Solidify modifier.


• Give it a Boolean modifier / Difference mode with the first circle as Object.


• Give it a Bevel modifier / Angle mode, with an Angle low enough to smooth the vertical internal edges.


• Smooth with a Subdivision Surface modifier and a Smooth Shading.


• Apply the modifier if you are happy with the result.

creasing edges with SHIFT + E could also be a non destructive option if you don't want to modify existing geometry

Create a 6 sided mesh circle and rotate it $30º$

Now add a slightly larger circle with three times more sides $3 times 6 = 18$ and also rotate it $30º$

Subdivide the inner circle with a number of cuts of 2

Bridge both circles and add the desired modifiers, like a Subsurf and Solidify

Now you can adjust the smoothness of the inner edges by selecting the two middle vertex of each edge, setting the Pivot center to 'Individual Origins', and scaling them up, outwards towards the edges.