I want to add the wall thickness around 1.5mm-2mm to that irregular pipe 
For me important is to have the lumen and therefore the inner surface not changed. I tried with solidify, I played with setting, but all the time I am narrowing the pipe, or some of irregularities are appearing inside the lumen. Its usually cracking when the number of thickness exceeds the offset
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Any ideas how to create a wall to mesh like this preserving inner surface intact?
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$\begingroup$ Hard to tell without looking at your topology, but looks like you should cleanly model the inner shell as a new cylinder object. You can then connect it to the existing outer shell manually $\endgroup$– Duarte Farrajota Ramos ♦Mar 12, 2018 at 1:14
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$\begingroup$ Just googled lumen, Interesting. $\endgroup$– Haunt_HouseMar 12, 2018 at 2:18
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1 Answer
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I don't think the solidify modifier was meant to handle such complex geometry. If you apply the modifier, you can repair any irregularities by hand.
The other idea would be to use the Shrinkwrap Modifier. It's ability to take the closest surface point as reference makes it pretty invulnerable to small holes.
Below is the result of a Cylinder with just 8 sides. I sandwiched the Shrinkwrap Modifier between two subsurfs. The first one decides how many verts the shrinker gets and the second is for smoothing. That way you can tweak how much inner surface structure leaks through.
All that's left is to apply the modifiers, join the meshes and stitch them together.
answered Mar 12, 2018 at 1:58