Hi Alexandr,

> Maybe there is special method to model things like this
> (it's mobile router back cap)?

Well like I wrote above, it's generally better to model things like this by using fillets to blend between some primary surfaces rather than trying to directly shape the blended areas all in one shot by either sweep or network.

When you see a broad flat-ish area, that should generally be modeled as one surface itself, then when you've got a tighter bent region between 2 of those flat-ish areas, use fillets to put those in.

Otherwise it can be difficult to control surface construction when you've got a lot of variation in shape happening in the profile curves. Basically when you have a profile shape that goes through some kind of tight bends in it, you're trying to squeeze a couple of shapes out of it instead of one broad shape and you can easily run into issues about how different pieces are being matched with one another, and stuff with pinching and squashing of shapes as they try to transition from one to the other across your single surface.

See these previous posts for some more examples of this kind of shape construction:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1002.2
http://moi3d.com/forum/index.php?webtag=MOI&msg=3137.1


Also here are some other examples of that general strategy of building some broader sheets of a model out of sweeps and then having a fillet provide a smooth juncture between them:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2164.2
http://moi3d.com/forum/index.php?webtag=MOI&msg=2164.4


Also Check out here for some links to previous discussions with some various tips for people coming from a poly modeling background:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4865.2

- Michael