A net of cylinder has a square (or rectangle) and two circles.
What do you think net of spherinder, coninder, etc... will be? At least, they would have two spheres, cones respectively.
quickfur wrote:The cubinder could be unrolled into a cube and 4 cylinders, that's correct.
However, the spherinder can't be unrolled that way, because the manifold that joins its two spherical ends has curvature in two dimensions. It has spherical cross-section, so it can't be unrolled without splitting into many irregular pieces. Just like the map of the earth can't be represented faithfully on a 2D map without distortions.
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The coninder can be unfolded into two cones, a cylinder, and a split cylinder, i.e., the extruded version of semicircle that you fold up into a cone.
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