roundedcube.scad - Fork me and make me better!

roundedcube.scad

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

// Set to 0.01 for higher definition curves (renders slower)
$fs = 0.15;

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

	translate_min = radius;
	translate_xmax = size[0] - radius;
	translate_ymax = size[1] - radius;
	translate_zmax = size[2] - radius;

	diameter = radius * 2;

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

	translate(v = obj_translate) {
		hull() {
			for (translate_x = [translate_min, translate_xmax]) {
				x_at = (translate_x == translate_min) ? "min" : "max";
				for (translate_y = [translate_min, translate_ymax]) {
					y_at = (translate_y == translate_min) ? "min" : "max";
					for (translate_z = [translate_min, translate_zmax]) {
						z_at = (translate_z == translate_min) ? "min" : "max";

						translate(v = [translate_x, translate_y, translate_z])
						if (
							(apply_to == "all") ||
							(apply_to == "xmin" && x_at == "min") || (apply_to == "xmax" && x_at == "max") ||
							(apply_to == "ymin" && y_at == "min") || (apply_to == "ymax" && y_at == "max") ||
							(apply_to == "zmin" && z_at == "min") || (apply_to == "zmax" && z_at == "max")
						) {
							sphere(r = radius);
						} else {
							rotate = 
								(apply_to == "xmin" || apply_to == "xmax" || apply_to == "x") ? [0, 90, 0] : (
								(apply_to == "ymin" || apply_to == "ymax" || apply_to == "y") ? [90, 90, 0] :
								[0, 0, 0]
							);
							rotate(a = rotate)
							cylinder(h = diameter, r = radius, center = true);
						}
					}
				}
			}
		}
	}
}

Thanks a lot for this. I just started using open scad and couldn't figure out how to make nice rounded edges. I tried minkowski but it totally messed up the dimensions and position of the object.

This works great. It's quite slow though, taking now few seconds to render when I change any parameteres.

Thanks for the feedback!! Yes, quite slow, but.... there's a workflow to get around this... You can raise the $fs value while you're developing the model, then lower it when you're ready for a production build.. It's been a while so I can't remember the various effects... but I wonder if a value of $fs = 0.5; or more would be usable while working on the model

I tried minkowski but it totally messed up the dimensions and position of the object.

This is not caused by an issue in the minkowski method. Instead this behaviour is inherent to it, because the two shapes are added to one another. If you want to correct for these shifts, I can present you a piece of code that "corrects" for shifts using rectangular shapes.

https://gist.github.com/odyzzeus/7ff76fad035e36600c47c6662e1fe4bb

Hi Daniel.

I'm running into a bug which rears its ugly head when one tries to set a radius for the cylinder of a single-axis rounding and the radius is larger than one or more of the dimensions of the object. I have an object where the thickness is 0.125 and the radius is 0.325. It makes the thickness of the object larger to compensate, which kinda sucks. It seems like the problem lies with the definitions of the translate variables at the top. If I can find the time, I will see about submitting a fix later.

Hi Daniel.

I'm running into a bug which rears its ugly head when one tries to set a radius for the cylinder of a single-axis rounding and the radius is larger than one or more of the dimensions of the object. I have an object where the thickness is 0.125 and the radius is 0.325. It makes the thickness of the object larger to compensate, which kinda sucks. It seems like the problem lies with the definitions of the translate variables at the top. If I can find the time, I will see about submitting a fix later.

It looks like @ggs67's fork fixes this. I think it would be a good idea to replace your code with theirs.

I'm running into a bug which rears its ugly head when one tries to set a radius for the cylinder of a single-axis rounding and the radius is larger than one or more of the dimensions of the object. I have an object where the thickness is 0.125 and the radius is 0.325. It makes the thickness of the object larger to compensate, which kinda sucks. It seems like the problem lies with the definitions of the translate variables at the top. If I can find the time, I will see about submitting a fix later.

It looks like @ggs67's fork fixes this. I think it would be a good idea to replace your code with theirs.

Yes, I'm glad you found that. It's been a while since I've been able to design or print but was aware of some forks... would you say that's the most ideal one to redirect people to when that issue crops up? https://gist.github.com/ggs67/ff6ba8caf5a1871d285c5c758dce0575