roundedcube_simple.scad

// More information: https://danielupshaw.com/openscad-rounded-corners/

module roundedcube_simple(size = [1, 1, 1], center = false, radius = 0.5) {
	// If single value, convert to [x, y, z] vector
	size = (size[0] == undef) ? [size, size, size] : size;

	translate = (center == false) ?
		[radius, radius, radius] :
		[
			radius - (size[0] / 2),
			radius - (size[1] / 2),
			radius - (size[2] / 2)
	];

	translate(v = translate)
	minkowski() {
		cube(size = [
			size[0] - (radius * 2),
			size[1] - (radius * 2),
			size[2] - (radius * 2)
		]);
		sphere(r = radius);
	}
}

Usage:

// A single integer creates a cube with the specified wall distance. Default [1, 1, 1]
size = 5;

// An [x, y, z] vector specifies distance on each axis. Default [1, 1, 1]
size = [2, 3, 5];

// Whether or not to place the object centered on the origin. Default false
center = true|false;

roundedcube_simple(size, center);

Examples:

color("Yellow")
roundedcube_simple(3, true, 0.9);

translate(v = [1, 0, 2])
color("Pink")
roundedcube_simple([4, 2, 2], false, 0.2);

translate(v = [-4, -1, 2])
color("Lightblue")
roundedcube_simple(2, false);

translate(v = [0, 0, 6])
color("Orange")
roundedcube_simple([3, 2, 2], true);

translate(v = [2.5, -0.5, 5])
color("Green")
roundedcube_simple([3, 2, 2], false, 0.09);

Output:

I am wondering about how to convert this to roundedcylinder_simple.

Thoughts?

I am wondering about how to convert this to roundedcylinder_simple.

Thoughts?

It's been a long while since I've worked on this...

I would think that a rounded cylinder could also involve the minkowski transform:

https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/The_OpenSCAD_Language#minkowski

So I guess you would take a cylinder, and then add another cylinder (or perhaps a sphere) on a perpendicular axis along the edge, then apply a minkowski transformation to the whole thing? Actually I wonder if I could have used a cylinder or two for this rather than a sphere, now that I'm digging back in a little bit... I hope/wish I can get back into printing and designing within the next few years!

I got what I needed by changing a few lines: module roundedcylinder_simple(size = [1, 1, 1], center = false, radius = 0.5) { // If single value, convert to [x, y, z] vector size = (size[0] == undef) ? [size, size, size] : size; translate = (center == false) ? [radius, radius, radius] : [ radius - (size[0] / 2), radius - (size[1] / 2), radius - (size[2] / 2) ]; translate(v = translate) minkowski() { cylinder(h = size[0] - (radius * 2), r1= size[1] - (radius * 2), r2 = size[2] - (radius * 2) ); sphere(r = radius); } } roundedcylinder_simple(size=[8,15,15],center=true,radius=2);

Thank you for sharing!!

Thanks to grovenectar for the roundedcube_simple() and roundedcube() modules - they helped me a lot, and enabled me to understand the minkowski operation!

Thanks to daSpud46 for the roundedcylinder_simple() module. However, I think that there is a mistake in the code.

Because he copied the translate part from grovenectar's roundedcube_simple() module, he assumed that the true/false choice affects cylinder in exactly the same way as it affects the position of cube(). But it doesn't!

In cube(), "true" locates the center of the cube at [0,0,0], and "false" locates the lower bottom corner at [0,0,0]. But with cylinder(), "true" only affects the z-position of the cylinder; Whether "true" or "false", the x-center and y-center of the cylinder() is always at [0,0].

So here is my modified code:

module roundedcylinder_simple(size = [1, 1, 1], center = false, radius = 0.5) {
   // If single value, convert to [x, y, z] vector
   size = (size[0] == undef) ? [size, size, size] : size;
  
   // roundedcylinder_simple(size = [height, bottom_radius, top_radius], center = false, radius);

   translate = (center == false) ?
               [0, 0, radius] :
               [0, 0, radius-size[0]/2];
                       
   translate(v = translate)
       minkowski() {
           cylinder(h = size[0] - (radius * 2),
                    r1= size[1] - (radius * 2),
                    r2 = size[2] - (radius * 2)
           );
           sphere(r = radius);
        }
}


$fs = 0.01;
$fn = 60;
roundedcylinder_simple(size=[8,5,5], center=false, radius=1);