Hello
How can I make a phase on a cube just on on side ?
minkowski() is a powerful function but with no control on witch border you
like to have a phase.

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You can't use minkowski()  this way.  By definition, it is impossible to get
an accurate "cube" with only one side rounded.

I normally use hull() to get a rounded "cubish" thing.  See the code and
example below.

// Cube with rounded face

dim = [100, 50, 40];

corner_r = 10;
grain = 1;

// Top edges and corners rounded, but spills onto the sides
hull()
{
// Define lower side of cube
translate ([0, 0, 0]) cube (grain);
translate ([dim.x - grain, 0, 0]) cube (grain);
translate ([dim.x - grain, dim.y-grain, 0]) cube (grain);
translate ([0, dim.y-grain, 0]) cube (grain);

// Rounded face
translate ([0+corner_r, 0+corner_r, dim.z-corner_r]) sphere (r=corner_r);
translate ([dim.x-corner_r, 0+corner_r, dim.z-corner_r]) sphere

(r=corner_r);
translate ([dim.x-corner_r, dim.y-corner_r, dim.z-corner_r]) sphere
(r=corner_r);
translate ([0+corner_r, dim.y-corner_r, dim.z-corner_r]) sphere
(r=corner_r);

}

// Create a rounded cube, but a flat bottom
translate ([-dim.x-10, 0, 0])
{
hull()
{
// Define lower side of cube
linear_extrude(1)
{

		translate ([0+corner_r, 0+corner_r, 0]) circle (r=corner_r);
		translate ([dim.x-corner_r, 0+corner_r, 0]) circle (r=corner_r);
		translate ([dim.x-corner_r, dim.y-corner_r, 0]) circle (r=corner_r);
		translate ([0+corner_r, dim.y-corner_r, 0]) circle (r=corner_r);
	}

	// Rounded top face
	translate ([0+corner_r, 0+corner_r, dim.z-corner_r]) sphere (r=corner_r);
	translate ([dim.x-corner_r, 0+corner_r, dim.z-corner_r]) sphere

(r=corner_r);
translate ([dim.x-corner_r, dim.y-corner_r, dim.z-corner_r]) sphere
(r=corner_r);
translate ([0+corner_r, dim.y-corner_r, dim.z-corner_r]) sphere
(r=corner_r);

}

}

http://forum.openscad.org/file/t486/roundedCube.png

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Thank you very much
I don't understand in the Moment how that works but I try !!!

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If you're willing to use a library I suggest this solution with the Belfry
OpenSCAD Library available at
https://github.com/revarbat/BOSL which will let you round any edges you want
on a cube.

include<lib/BOSL/shapes.scad>
include<lib/BOSL/constants.scad>

$fn=36;
cuboid([10,10,10], fillet=2, edges=EDGES_TOP);  // just top edges rounded
right(15)cuboid([10,10,10], fillet=2, edges=EDGES_ALL-EDGES_BOTTOM);  //
all but the bottom
right(30)cuboid([10,10,10], fillet=2, edges=EDGE_RT_FT);  // just one edge

http://forum.openscad.org/file/t2477/roundedcube.png

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Tank you thank you that is awesome !!!!!!

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