Parametric M.2 mockup generator

M.2.scad

// M.2 Mockup Generator
// by Nirav Patel <https://eclecti.cc>
//
// To the extent possible under law, Nirav Patel has waived all copyright
// and related or neighboring rights to M.2 Mockup Generator.
//
// An easy to use parametric M.2 mockup generator.
// See https://en.wikipedia.org/wiki/M.2 for more information about the 
// M.2 (formerly NGFF) standard.

edge_width = 19.85;
edge_length = 4;
edge_r = 0.5;
hole_r = 1.75;
key_r = 0.6;
key_length = 3.5;

pcb_thick = 0.8;
bottom_edge_keepout = 5.2;
top_gnd_pad_r = 2.75;
bottom_gnd_pad_r = 3;
bottom_gnd_pad_offset = 1;
bevel = 0.3;
bevel_angle = 20;

$fn=50;

module key_cutout() {
    union() {
        translate([0, key_length - key_r]) circle(r = key_r);
        translate([-key_r, -1]) square([key_r*2,key_length - key_r +1]);
    }
}

function get_key(key_type="mm") =
    key_table[search([key_type],key_table,1,0)[0]][1];

key_table = [["", 100], ["A", 6.625], ["B", 5.625], ["C", 4.625], ["D", 3.625], ["E", 2.625], ["F", 1.625], ["G", -1.125], ["H", -2.125], ["J", -3.125], ["K", -4.125], ["L", -5.125], ["M", -6.125]];

module m2_2d(width=22, length=30, key="M", key2="") {
    // Start with a 2d version
    difference() {
        square([width, length]);
        
        // Left cutout
        translate([(width-edge_width)/2-width, -edge_r]) square([width, edge_length]);
        translate([(width-edge_width)/2-width-edge_r, 0]) square([width, edge_length]);
        translate([(width-edge_width)/2-edge_r, edge_length-edge_r]) circle(r=edge_r);
        
        // Right cutout
        translate([width-(width-edge_width)/2, -edge_r]) square([width, edge_length]);
        translate([width-(width-edge_width)/2+edge_r, 0]) square([width, edge_length]);
        translate([width-(width-edge_width)/2+edge_r, edge_length-edge_r]) circle(r=edge_r);
        
        // Hole cutout
        translate([width/2, length]) circle(r = hole_r);
        
        // Key cutouts
        translate([width/2 + get_key(key), 0])
            key_cutout();
        
        translate([width/2 + get_key(key2), 0])
            key_cutout();
    }
}

module m2_text(width=22, length=30, height="", key="", key2="") {
    if (key2 != "") {
        string = str(width, length, "-", height, "-", key, "-", key2);
        linear_extrude(height = 1)
            text(string, size = 2.5);
    } else {
        string = str(width, length, "-", height, "-", key);
        linear_extrude(height = 1)
            text(string, size = 2.5);
    }
}

module m2(width=22, length=30, height="", key="", key2="") {
    union() {
        difference() {
            linear_extrude(height = pcb_thick)
                m2_2d(width, length, key, key2);
            
            // The card edge bevel
            translate([0, bevel, 0]) rotate([180-bevel_angle, 0, 0]) cube([width, 10, 10]);
            translate([0, bevel, pcb_thick]) rotate([90+bevel_angle, 0, 0]) cube([width, 10, 10]);
        }
        
        difference() {
            // The various component keepout zones and embossed text
            if (height == "S1") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.2]);
                    translate([1, edge_length+1, pcb_thick+1.2-0.5]) m2_text(width, length, height, key, key2);
                }
            } else if (height == "S2") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.35]);
                    translate([1, edge_length+1, pcb_thick+1.35-0.5]) m2_text(width, length, height, key, key2);
                }
            } else if (height == "S3") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.5]);
                    translate([1, edge_length+1, pcb_thick+1.5-0.5]) m2_text(width, length, height, key, key2);
                }
            } else if (height == "D1") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.2]);
                    translate([1, edge_length+1, pcb_thick+1.2-0.5]) m2_text(width, length, height, key, key2);
                }
                translate([0, bottom_edge_keepout, -1.35]) cube([width, length-bottom_edge_keepout, 1.35]);
            } else if (height == "D2") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.35]);
                    translate([1, edge_length+1, pcb_thick+1.35-0.5]) m2_text(width, length, height, key, key2);
                }
                translate([0, bottom_edge_keepout, -1.35]) cube([width, length-bottom_edge_keepout, 1.35]);
            } else if (height == "D3") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.5]);
                    translate([1, edge_length+1, pcb_thick+1.5-0.5]) m2_text(width, length, height, key, key2);
                }
                translate([0, bottom_edge_keepout, -1.35]) cube([width, length-bottom_edge_keepout, 1.35]);
            } else if (height == "D4") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.5]);
                    translate([1, edge_length+1, pcb_thick+1.5-0.5]) m2_text(width, length, height, key, key2);
                }
                translate([0, bottom_edge_keepout, -0.7]) cube([width, length-bottom_edge_keepout, 0.7]);
            } else if (height == "D5") {
                difference() {
                    translate([0, edge_length, pcb_thick]) cube([width, length-edge_length, 1.5]);
                    translate([1, edge_length+1, pcb_thick+1.5-0.5]) m2_text(width, length, height, key, key2);
                }
                translate([0, bottom_edge_keepout, -1.5]) cube([width, length-bottom_edge_keepout, 1.5]);
            } else {
                translate([1, edge_length+1, pcb_thick-0.5]) m2_text(width, length, height, key, key2);
            }
            
            // The ground pad keepouts
            translate([width/2, length, pcb_thick]) cylinder(r = top_gnd_pad_r, h = 10);
            translate([width/2, length-bottom_gnd_pad_offset, -10]) {
                cylinder(r = bottom_gnd_pad_r, h = 10);
                translate([-bottom_gnd_pad_r, 0, 0]) cube([bottom_gnd_pad_r*2, bottom_gnd_pad_offset, 10]);
            }
        }
    }
}

m2(width=22, length=30, height="S3", key="A", key2="E");