'Issue bringing SVG file into Openscad

I am using the following Code to turn a somewhat complicated SVG file into a 3D plate for the letterpress printing process. I get a mesh error when I can find no issues within the SVG itself. All of the paths are closed.

I added the Offset(delta=0.001) and that seemed to help on simple SVG's with simple shapes or a small amount of text. But I have been processing the SVG that I am attaching here for over 12 hours and it seems to be stuck somewhere. (Screenshot Attached)

scad screenshot

file = "InviteFinal.svg";
width = 139.7;
height = 215.9;

feature_height = 1.143;
plate_thickness = 0.254;

union()
{
    minkowski()
    {
        linear_extrude(height = 0.1, center = false, convexity = 10)
        scale([-1, 1, 1])
        translate([-width, 0, 0])
        offset(delta=0.001)
        import(file);
        
        
        cylinder(feature_height - 0, 0.25, 0);
    }
    
    translate([-10,-10,-0.254])
    cube([width+20,height+20,plate_thickness]);

    minkowski()
    {
        union()
        {
            translate([width+5,height,0])
            cube([5,0.8,0.2],true);

            translate([width,height+5,0])
            cube([0.8,5,0.2], true);


            translate([-5,0,0])
            cube([5,0.8,0.2],true);

            translate([0,-5,0])
            cube([0.8,5,0.2], true);


            translate([width+5,0,0])
            cube([5,0.8,0.2],true);

            translate([width,-5,0])
            cube([0.8,5,0.2], true);


            translate([-5,height,0])
            cube([5,0.8,0.2],true);

            translate([0,height+5,0])
            cube([0.8,5,0.2], true);
        }
        
        cylinder(feature_height - 0.1, 0.2, 0);
    }
}

SVG file

openscad


Solution 1:[1]

The problem is the first minkowski() sum on the extruded text and the cylinder. The purpose of doing a minkowski() sum is to round the corners on objects. The more corners there are the longer it takes. So for things like the letter 'O' it will take a long time.

From the OpenSCAD documentation for minkowski:

Warning: for high values of $fn the minkowski sum may end up consuming lots of CPU and memory, since it has to combine every child node of each element with all the nodes of each other element. So if for example $fn=100 and you combine two cylinders, then it does not just perform 200 operations as with two independent cylinders, but 100*100 = 10000 operations.

To troubleshoot I removed the second half of the file from the second minkowski sum on down. That locked up OpenSCAD and I had to close it. When I removed the first minkowski() sum so that just the svg was extruded it rendered in 5 seconds. What effect are you trying to achieve by doing a minkowski sum on the svg?

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 FractalLotus

Related Questions