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I'm new to modeling. I want to make a cylinder-shape object as follow. I'm thinking of it as a twisted cylinder.

I tried using twist modifier on a cylinder but the result was disapointing.

How should I make them? I'm using Blender 2.8

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I would use the Screw modifier for both examples, assigned to simple profile meshes.

enter image description here

Because the longitudinal connections are staggered, this method avoids the creation of twisted, non-planar faces.

enter image description here

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For you first sketch just twist any regular n-gon with enough vertical loop-cuts (subdivisions) to support the twisting (simple deform: twist modifier):

enter image description here

For the second example this looks like a spiral cut into a cylinder. You can just edit the previous shape, delete every other groove and join the vertices with vertical edges (use F2 addon to do that fast), or you can:

  • create a spiral with addon Add Curve: Extra Objects
  • set bevel for the curve, set fill:Full, convert to mesh and fill the caps

  • do a boolean difference

    enter image description here

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