Rail stopper for MGN9H on 2020 Extrusion

mgn9h-rail-stopper-on-2020.openscad

// Rail stopper for MGN9H on 2020 Extrusion
// by github.com/ushiocheng

// WARNING: this is not tested

// variant 0: counterbored hole
// variant 1: rail guide
variant=1;

zfc=0.001; // correcting z-fighting in render view, not actually printable/functional

translate(variant==1?[0,15,10]:[0,0,0])
rotate(variant==1?[180,0,0]:[0,0,0])
difference(){
    union(){
        cube([18,15,10]);
        // Align feature with rail, would be difficult to print
        if (variant==1)
        translate([6.1,0,-1.8]){
            cube([6-0.2,15,1.8+zfc]);
        }
    }
    union(){
        // M5x10 BHCS counterbored clearance hole
        if (variant==0)
        translate([9,8,10-5+zfc]) {
            cylinder(h=5,d=10,center=false);
        }
        translate([9,8,-2]) {
            cylinder(h=100,d=5.5,center=false);
        }
        if (variant==1)
        translate([6,8-6/2,-1.8-zfc]){
            cube([6,6,1.8+zfc]);
        }
        // Chamfers, 3 of them on larger part
        translate([0-zfc,15+zfc,10+zfc]){
            rotate([90,0,0]){
                linear_extrude(15+2*zfc){
                    polygon([
                        [0,0],
                        [2,0],
                        [0,-2]
                    ]);
                }
            }
        }
        translate([18-2+zfc,15+zfc,10+zfc]){
            rotate([90,0,0]){
                linear_extrude(15+2*zfc){
                    polygon([
                        [0,0],
                        [2,0],
                        [2,-2]
                    ]);
                }
            }
        }
        translate([0-zfc,0-zfc,10+zfc]){
            rotate([0,90,0]){
                linear_extrude(18+2*zfc){
                    polygon([
                        [0,0],
                        [2,0],
                        [0,2]
                    ]);
                }
            }
        }
        // 2 more chamfer on the smaller part
        if (variant==1){
        translate([6.1-zfc,15+zfc,0-zfc]){
            rotate([90,0,0]){
                linear_extrude(15+2*zfc){
                    polygon([
                        [0,0],
                        [0,-1.8],
                        [.5,-1.8]
                    ]);
                }
            }
        }
        translate([12-0.1+zfc,15+zfc,0-zfc]){
            rotate([90,0,0]){
                linear_extrude(15+2*zfc){
                    polygon([
                        [0,0],
                        [0,-1.8],
                        [-.5,-1.8]
                    ]);
                }
            }
        }}
    }
}