u/GooeyGungan

I've modeled a pipe intersection like you can see in the image, but because of how I subtracted the extra parts of each pipe, there's an infinitely thin wall in the middle of the intersection. Any suggestions on how to get rid of that without making a visible cut in the inside of the intersection?

Here's my code:

include <BOSL2/std.scad>
$fa = 1;
$fs = 0.4;
outer_diameter = 100;
inner_diameter = 96.8;
lower_height = 34;
upper_height = 25;
pipe_angle = 15;

diff()
// lower tube
cyl(h=lower_height,d=outer_diameter,anchor=BOTTOM) {
    // inner negative
    tag("remove")
        position(CENTER)
        down(1)
        cyl(h=lower_height+2,d=inner_diameter);
    // remove parts that would intersect with the other tube
    tag("remove")
        position(FRONT+TOP)
        xrot(-pipe_angle/2)
        cyl(h=100,d=outer_diameter+10,anchor=FRONT+BOTTOM);
    // upper tube
    tag_diff("keep", "rem", "ke") position(FRONT+TOP)
        xrot(-pipe_angle)
        cyl(h=upper_height,d=outer_diameter,anchor=BOTTOM+FRONT) {
            // inner negative
            tag("rem")
                cyl(h=upper_height+2, d=inner_diameter);
            // remove parts that would intersect with the other tube
            tag("rem")
                position(FRONT+BOTTOM)
                xrot(pipe_angle/2)
                cyl(h=100,d=outer_diameter+10,anchor=FRONT+TOP);
        }
}