xyRepRap/lib/linear_bearing.scad

include <bearing_idler.scad>
include <e3d_v6_all_metall_hotend.scad>

// #######################################################
// ################### Linear Bearings ###################
// #######################################################

lm8uu_outer = 15;
lm8uu_inner = 8;
lm8uu_height = 24;

x_rail_dist = 70;

lm8uu_dia_add = 0.5;
lm8uu_len_add = 1.0;
rail_dia_add = 3.0;
y_carriage_wall = 10; // z-axis
y_carriage_len_add = 15; // y-axis
y_carriage_width = 25; // x-axis
y_carriage_block_width = 10; // x-axis
y_carriage_block_height = 10; // z-axis
y_carriage_rail_support = 2; // dist between rail and edge

y_carriage_length = x_rail_dist + (2 * y_carriage_len_add);

rail_mount_dia_add = 0.4;
x_rail_mount_width = 10;
x_rail_cutout_z = 0.5; // in x-axis
x_rail_cutout_x = 0.5; // in z-axis
x_rail_cutout_y = x_rail_dist - (2 * y_carriage_len_add);
x_rail_hole_off = 5;
x_rail_block_len = (y_carriage_length - x_rail_cutout_y) / 2;

x_carriage_width = 80;
x_carriage_len_add = 10;
x_carriage_wall = 10;
x_carriage_bearing_off = 3;

x_carriage_belt_off = 19;
x_carriage_belt_block_width = 8;
x_carriage_belt_block_length = 8;
x_carriage_belt_block_height = 25;
x_carriage_belt_block_height_b = x_carriage_belt_block_height - 7;
x_carriage_block_hole_off = 6.0;
x_carriage_block_length = 4;
x_carriage_block_off = 2.5;
x_carriage_block_add = 4.4;

x_carriage_length = x_rail_dist + (2 * x_carriage_len_add);

x_carriage_block_height = 2 * (x_carriage_block_hole_off + x_carriage_block_add);

x_cutout_width = x_carriage_width - (2 * x_carriage_belt_block_width) - 5;
x_cutout_length = x_rail_dist - 25;

// y-carriage belt idlers
idler_a_blue = [  19,               15,  5.5];
idler_a_red  = [  19, x_rail_dist + 15, 12.5];
idler_b_blue = [30.3, x_rail_dist + 15, 12.5];
idler_b_red  = [30.3,               15,  5.5];

e3d_v6_dist_x = 23 + 5;
e3d_v6_dist_y = 18 + 1;
e3d_v6_z_off = 13;

e3d_clamp_width = x_cutout_width;
e3d_clamp_width_add = 10;
e3d_clamp_length = e3d_v6_dist_y;
e3d_clamp_b_length = ((x_cutout_length - e3d_clamp_length) / 2) + 7;
e3d_clamp_height = e3d_upper_small_height;
e3d_clamp_dia_add = 0.2;
e3d_clamp_cut = 0.2; // x2
e3d_clamp_hole_off = 4;
e3d_hole_dia = 3.2;

fan_mount_wall = 5;
fan_mount_inset = 6;
fan_mount_hole_inset = 8;
fan_width = 40;
fan_height = 20;
fan_hole_off = 3.9;

universal_mount_hole_off = 6;

nut_cut_width = 5.7;
nut_cut_depth = 2.6;
nut_cut_off = 3.2;
nut_cut_height = 20;

sensor_mount_width_add = 8;
sensor_mount_wall = 4;
sensor_mount_y_offset = -1;
sensor_mount_height = 8;
sensor_dia = 19;
sensor_dia_add = 6;

sensor_mount_width = (2 * universal_mount_hole_off) + sensor_mount_width_add;

draw_x_carriage = false;
draw_e3d_fan_duct = true;

draw_y_carriage = false;
draw_y_carriage_idlers = true;
draw_rail_len = 200;


// TODO add cable tie canal for lm8uu mounting
// TODO get ready to actually print these


module nut_cut() {
    translate([-nut_cut_width / 2, 1, nut_cut_off - nut_cut_height]) {
        cube([nut_cut_width, nut_cut_depth, nut_cut_height]);
        translate([nut_cut_width / 2, -5, nut_cut_height - nut_cut_off])
            rotate([-90, 0, 0])
            cylinder(d = 3.2, h = nut_cut_depth + 5);
    }
}

module lm8uu() {
    $fn = 15;
    difference() {
        cylinder(d = lm8uu_outer, h = lm8uu_height);
        translate([0, 0, -1])
            cylinder(d = lm8uu_inner, h = lm8uu_height + 2);
    }
}

module generate_spacer(pos) {
    color("green")
    translate([pos[0], pos[1], -0.5])
        bearing_spacer(pos[2] + 0.5 + ((idler_outer_height - bearing_height) / 2), 2, 1, true, 3);
}

module y_carriage(idler_a = [0, 0, 0], idler_b = [0, 0, 0]) {
    $fn = 20;
    
    // attaching to x-rails
    color("green")
    translate([y_carriage_width, 0, -y_carriage_block_height])
    difference() {
        cube([x_rail_mount_width, y_carriage_length, y_carriage_block_height + y_carriage_wall]);
        
        translate([0, -1, y_carriage_block_height])
            cube([x_rail_cutout_z, y_carriage_length + 2, y_carriage_wall + 1]);
        
        translate([0, -1, y_carriage_block_height - (x_rail_cutout_x / 2)])
            cube([y_carriage_block_width + 1, y_carriage_length + 2, x_rail_cutout_x]);
        
        translate([0, (y_carriage_length - x_rail_cutout_y) / 2, y_carriage_block_height])
            cube([y_carriage_block_width + 1, x_rail_cutout_y, y_carriage_wall + 1]);
        
        for (i = [y_carriage_len_add : x_rail_dist : x_rail_dist + y_carriage_len_add]) {
            translate([0, i, y_carriage_block_height])
                rotate([0, 90, 0])
                cylinder(d = lm8uu_inner + rail_mount_dia_add, h = y_carriage_block_width + 1);
        }
        
        for (i = [0 : x_rail_block_len + x_rail_cutout_y : x_rail_block_len + x_rail_cutout_y]) {
            translate([y_carriage_block_width / 2, x_rail_hole_off + i, -1]) {
                cylinder(d = 3.2, h = y_carriage_wall + 2 + y_carriage_block_height);
                cylinder(d = 6.1, h = 3.8, $fn = 6);
                translate([0, 0, y_carriage_wall + y_carriage_block_height - 2.5])
                    cylinder(d = 6.1, h = 3.8);
            }
            
            translate([y_carriage_block_width / 2, x_rail_block_len - x_rail_hole_off + i, -1]) {
                cylinder(d = 3.2, h = y_carriage_wall + 2 + y_carriage_block_height);
                cylinder(d = 6.1, h = 3.8, $fn = 6);
                translate([0, 0, y_carriage_wall + y_carriage_block_height - 2.5])
                    cylinder(d = 6.1, h = 3.8);
            }
        }
    }
    
    // attaching to y-rail
    color("green")
    difference() {
        union() {
            cube([y_carriage_width, y_carriage_length, y_carriage_wall]);
            
            translate([y_carriage_width - y_carriage_block_width, 0, -y_carriage_block_height])
                cube([y_carriage_block_width, y_carriage_length, y_carriage_block_height]);
        }
        
        translate([(lm8uu_outer + lm8uu_dia_add) / 2 + y_carriage_rail_support, 0, 0])
        rotate([-90, 0, 0]) {
            translate([0, 0, -1])
                cylinder(d = lm8uu_inner + rail_dia_add, h = y_carriage_length + 2);
            
            translate([0, 0, y_carriage_rail_support - lm8uu_len_add / 2])
                cylinder(d = lm8uu_outer + lm8uu_dia_add, h = lm8uu_height + lm8uu_len_add);
        
            translate([0, 0, y_carriage_length - lm8uu_height - y_carriage_rail_support - lm8uu_len_add / 2])
                cylinder(d = lm8uu_outer + lm8uu_dia_add, h = lm8uu_height + lm8uu_len_add);
        }
    }
    
    color("magenta")
    translate([(lm8uu_outer + lm8uu_dia_add) / 2 + y_carriage_rail_support, 0, 0])
    rotate([-90, 0, 0]) {
        // y-bearings
        %translate([0, 0, y_carriage_rail_support])
            lm8uu();
        %translate([0, 0, y_carriage_length - lm8uu_height - y_carriage_rail_support])
            lm8uu();
    }
    
    // idlers for the corexy belts
    translate([0, 0, y_carriage_wall]) {
        if (draw_y_carriage_idlers) {
            translate(idler_a)
                bearing_idler();
            
            translate(idler_b)
                bearing_idler();
        }
        
        generate_spacer(idler_a);
        generate_spacer(idler_b);
    }
}

module belt_fix() {
    difference() {
        color("green")
        cube([x_carriage_belt_block_width, x_carriage_block_length, x_carriage_block_height]);
        
        translate([x_carriage_belt_block_width / 2, -1, x_carriage_block_hole_off - 0.2])
        rotate([-90, 0, 0]) {
            cylinder(d = 3.2, h = x_carriage_belt_block_length + 2);
            cylinder(d = 6.1, h = 3.8, $fn = 6);
        }
            
        translate([x_carriage_belt_block_width / 2, -1, x_carriage_block_height - -x_carriage_block_hole_off - 9])
        rotate([-90, 0, 0]) {
            cylinder(d = 3.2, h = x_carriage_belt_block_length + 2);
            cylinder(d = 6.1, h = 3.8, $fn = 6);
        }
    }
}

module belt_mount(top, up) {
    $fn = 15;
    
    difference() {
        color("green")
        if (top) {
            cube([x_carriage_belt_block_width, x_carriage_belt_block_length, x_carriage_belt_block_height]);
        } else {
            cube([x_carriage_belt_block_width, x_carriage_belt_block_length, x_carriage_belt_block_height_b]);
        }
        
        if (top) {
            translate([-1, x_carriage_belt_block_length / 2, 16])
                rotate([0, 90, 0])
                cylinder(d = 2.6, h = x_carriage_belt_block_width + 2);
            
            translate([x_carriage_belt_block_width / 2, -1, 16 + x_carriage_block_hole_off])
                rotate([-90, 0, 0])
                cylinder(d = 3.2, h = x_carriage_belt_block_length + 2);
            translate([x_carriage_belt_block_width / 2, -1, 16 - x_carriage_block_hole_off])
                rotate([-90, 0, 0])
                cylinder(d = 3.2, h = x_carriage_belt_block_length + 2);
        } else {
            translate([-1, x_carriage_belt_block_length / 2, 9])
                rotate([0, 90, 0])
                cylinder(d = 2.7, h = x_carriage_belt_block_width + 2);
            translate([x_carriage_belt_block_width / 2, -1, 9 + x_carriage_block_hole_off])
                rotate([-90, 0, 0])
                cylinder(d = 3.2, h = x_carriage_belt_block_length + 2);
            translate([x_carriage_belt_block_width / 2, -1, 9 - x_carriage_block_hole_off])
                rotate([-90, 0, 0])
                cylinder(d = 3.2, h = x_carriage_belt_block_length + 2);
        }
    }
    
    if (up) {
        if (top) {
            translate([0, x_carriage_belt_block_length + x_carriage_block_off, x_carriage_belt_block_height - x_carriage_block_height])
                belt_fix();
        } else {
            translate([0, x_carriage_belt_block_length + x_carriage_block_off, x_carriage_belt_block_height_b - x_carriage_block_height])
                belt_fix();
        }
    } else {
        if (top) {
            translate([0, -x_carriage_block_length - x_carriage_block_off, x_carriage_belt_block_height - x_carriage_block_height])
                belt_fix();
        } else {
            translate([0, -x_carriage_block_length - x_carriage_block_off, x_carriage_belt_block_height_b - x_carriage_block_height])
                belt_fix();
        }
    }
}

module belt_mounts() {
    translate([0, x_carriage_belt_off, 0])
        belt_mount(false, true);
    
    translate([0, x_carriage_length - x_carriage_belt_off - x_carriage_belt_block_length, 0])
        belt_mount(true, false);
    
    translate([x_carriage_width - x_carriage_belt_block_width, x_carriage_belt_off, 0])
        belt_mount(true, true);
    
    translate([x_carriage_width - x_carriage_belt_block_width, x_carriage_length - x_carriage_belt_off - x_carriage_belt_block_length, 0])
        belt_mount(false, false);
}

module x_carriage() {
    $fn = 20;
    
    //color("green")
    difference() {
        union() {
            color("green")
            cube([x_carriage_width, x_rail_dist + (2 * x_carriage_len_add), x_carriage_wall]);
            
            translate([0, 0, x_carriage_wall])
                belt_mounts();
        }
        
        // big center cutout
        translate([x_carriage_width / 2, x_carriage_length / 2, x_carriage_wall / 2])
            cube([x_cutout_width, x_cutout_length, x_carriage_wall + 2], center=true);
        
        for (i = [0 : 1 : 1]) {
            translate([lm8uu_height + x_carriage_bearing_off + (i * (x_carriage_width - (2 * x_carriage_bearing_off) - lm8uu_height)), 0, ])
            rotate([0, -90, 0]) {
                // x-bearings
                color("magenta")
                %translate([0, x_carriage_len_add, 0])
                    lm8uu();
                
                color("magenta")
                %translate([0, x_rail_dist + x_carriage_len_add, 0])
                    lm8uu();
                
                color("green")
                translate([0, x_carriage_len_add, 0])
                    cylinder(d = lm8uu_outer + lm8uu_dia_add, h = lm8uu_height + lm8uu_len_add);
                
                color("green")
                translate([0, x_rail_dist + x_carriage_len_add, 0])
                    cylinder(d = lm8uu_outer + lm8uu_dia_add, h = lm8uu_height + lm8uu_len_add);
                
                color("green")
                translate([0, x_carriage_len_add, -x_carriage_width])
                    cylinder(d = lm8uu_inner + rail_dia_add, h = x_carriage_width * 2);
                
                color("green")
                translate([0, x_rail_dist + x_carriage_len_add, -x_carriage_width])
                    cylinder(d = lm8uu_inner + rail_dia_add, h = x_carriage_width * 2);
            }
        }
        
        /* mounting for hotend / tool */
        
        // left mounting screw
        translate([5.5, x_carriage_length / 2, -1])
            cylinder(d = e3d_hole_dia, h = x_carriage_wall + 12);
        // right mounting screw
        translate([x_carriage_width - 5.5, x_carriage_length / 2, -1])
            cylinder(d = e3d_hole_dia, h = x_carriage_wall + 12);
        
        // bottom mounting screw
        translate([x_carriage_width / 2, 19, -1])
            cylinder(d = e3d_hole_dia, h = x_carriage_wall + 12);
        // top mounting screw
        translate([x_carriage_width / 2, x_carriage_length - 19, -1])
            cylinder(d = e3d_hole_dia, h = x_carriage_wall + 12);
        
        // fan mount attachment holes on left side
        translate([-fan_mount_wall - 1, ((x_carriage_length - fan_width) / 2) + fan_mount_hole_inset, x_carriage_wall / 2])
            rotate([0, 90, 0])
            cylinder(d = 3.2, h = ((x_carriage_width - x_cutout_width) / 2) + fan_mount_wall + 2);
        translate([-fan_mount_wall - 1, ((x_carriage_length + fan_width) / 2) - fan_mount_hole_inset, x_carriage_wall / 2])
            rotate([0, 90, 0])
            cylinder(d = 3.2, h = ((x_carriage_width - x_cutout_width) / 2) + fan_mount_wall + 2);
            
        // fan mount attachment holes on right side
        translate([((x_carriage_width + x_cutout_width) / 2) - 1, ((x_carriage_length - fan_width) / 2) + fan_mount_hole_inset, x_carriage_wall / 2])
            rotate([0, 90, 0])
            cylinder(d = 3.2, h = ((x_carriage_width - x_cutout_width) / 2) + fan_mount_wall + 2);
        translate([((x_carriage_width + x_cutout_width) / 2) - 1, ((x_carriage_length + fan_width) / 2) - fan_mount_hole_inset, x_carriage_wall / 2])
            rotate([0, 90, 0])
            cylinder(d = 3.2, h = ((x_carriage_width - x_cutout_width) / 2) + fan_mount_wall + 2);
            
        // universal add-on mounting on front
        translate([(x_carriage_width / 2) + universal_mount_hole_off, 0, x_carriage_wall / 2])
            rotate([0, 180, 0])
            nut_cut();
        translate([(x_carriage_width / 2) - universal_mount_hole_off, 0, x_carriage_wall / 2])
            rotate([0, 180, 0])
            nut_cut();
            
        // universal add-on mounting on back
        translate([(x_carriage_width / 2) + universal_mount_hole_off, x_carriage_length, x_carriage_wall / 2])
            rotate([0, 180, 180])
            nut_cut();
        translate([(x_carriage_width / 2) - universal_mount_hole_off, x_carriage_length, x_carriage_wall / 2])
            rotate([0, 180, 180])
            nut_cut();
    }
    
    translate([(x_carriage_width - sensor_mount_width) / 2, -sensor_mount_wall, 0])
        sensor_mount();
    
    translate([(x_carriage_width - sensor_mount_width) / 2, x_carriage_length, 0])
        radial_fan_mount();
    
    e3d_v6_triple_mount();
}

module radial_fan_mount() {
    color("yellow")
    universal_mount_plate();
    
    color("yellow")
    translate([-52, 0, 0])
        cube([52, sensor_mount_wall, x_carriage_wall]);
    
    color("yellow")
    translate([-9, 0, x_carriage_wall])
    
    difference() {
        cube([9, sensor_mount_wall, 13]);
        translate([4.5, -1, 9])
            rotate([-90, 0, 0])
            cylinder(d = 4.2, h = sensor_mount_wall + 2);
    }
    
    color("yellow")
    translate([-52, 0, -23])
    difference() {
        cube([9, sensor_mount_wall, 23]);
        translate([4.5, -1, 4])
            rotate([-90, 0, 0])
            cylinder(d = 4.2, h = sensor_mount_wall + 2);
    }
    
    // 5015 fan mockup
    %color("gray")
    translate([-(x_carriage_width - sensor_mount_width) / 2 + 4, sensor_mount_wall, 0])
        rotate([90, 0, 180])
        fan_5015();
}

module fan_5015() {
    // adapted from https://www.thingiverse.com/thing:1383913
    $fn=30;
    difference() {
        union() {
            hull() {
                translate([0.5, 0, 0]) cylinder(d=50, h=15);
                translate([-1, 0, 0]) cylinder(d=50, h=15);
            }
            hull() {
                translate([-43/2, 38/2, 0]) cylinder(d=7, h=15);
                translate([43/2, -38/2, 0]) cylinder(d=7, h=15);
            }
            translate([-26, -26, 0]) cube([20,26,15]);
        }
        difference() {
            union() {
                translate([-26+16+11,-2,1]) cylinder(d=32, h=15);
                translate([0,0,1]) hull(){
                    translate([0.5, 0]) cylinder(d=48, h=13);
                    translate([-1, 0]) cylinder(d=48, h=13);
                }
                translate([-25,-27,1]) cube([18,25,13]);
            }
            translate([-26+16+11,-2,1]) cylinder(d=24, h=15);
        }
        translate([-43/2, 38/2, -1]) cylinder(d=4.4, h=17);
        translate([43/2, -38/2, -1]) cylinder(d=4.4, h=17);
    }
}

module universal_mount_plate() {
    difference() {
        cube([sensor_mount_width, sensor_mount_wall, x_carriage_wall]);
        
        translate([sensor_mount_width_add / 2, -1, x_carriage_wall / 2])
            rotate([-90, 0, 0])
            cylinder(d = 3.2, h = sensor_mount_wall + 2);
        
        translate([(universal_mount_hole_off * 2) + (sensor_mount_width_add / 2), -1, x_carriage_wall / 2])
            rotate([-90, 0, 0])
            cylinder(d = 3.2, h = sensor_mount_wall + 2);
    }
}

module sensor_mount() {
    $fn = 30;
    
    color("yellow")
    universal_mount_plate();
    
    color("yellow")
    translate([sensor_mount_width / 2, -(sensor_dia + sensor_dia_add) / 2, -sensor_mount_height])
    difference() {
        hull() {
            translate([-sensor_mount_width / 2, (sensor_dia + sensor_dia_add) / 2, 0])
                cube([sensor_mount_width, sensor_mount_wall, sensor_mount_height]);
            
            translate([0, sensor_mount_y_offset, 0])
                cylinder(d = sensor_dia + sensor_dia_add, h = sensor_mount_height);
        }
        
        translate([0, sensor_mount_y_offset, -1])
            cylinder(d = sensor_dia, h = sensor_mount_height + 2);
    }
    
    // sensor mockup
    %translate([sensor_mount_width / 2, -(sensor_dia + sensor_dia_add) / 2 + sensor_mount_y_offset, -22]) {
        color("gray")
        cylinder(d = 18.2, h = 55);
        
        color("orange")
        translate([0, 0, -10])
            cylinder(d = 18.2, h = 10);
    }
}

module e3d_v6_triple_mount() {
    translate([x_carriage_width / 2, x_carriage_length / 2, -e3d_v6_height + x_carriage_wall + e3d_v6_z_off]) {
        
        color("red")
        %translate([-e3d_v6_dist_x / 2, e3d_v6_dist_y / 2, 0])
            e3d_v6();
        
        color("yellow")
        %translate([e3d_v6_dist_x / 2, e3d_v6_dist_y / 2, 0])
            e3d_v6();
        
        color("blue")
        %translate([0, (e3d_v6_dist_y / 2) - e3d_v6_dist_y, 0])
            rotate([0, 0, 180])
            e3d_v6();
    }
    
    echo(m3_screw_len=e3d_clamp_length + (2 * e3d_clamp_b_length));
    
    // hotend clamp center piece
    translate([(x_carriage_width - e3d_clamp_width) / 2, (x_carriage_length - e3d_clamp_length) / 2, x_carriage_wall])
    difference() {
        union() {
            // center clamp part
            color("magenta")
            translate([-e3d_clamp_width_add, e3d_clamp_cut, 0])
                cube([e3d_clamp_width + (2 * e3d_clamp_width_add), e3d_clamp_length - (2 * e3d_clamp_cut), e3d_clamp_height]);
            
            // blue clamp
            color("cyan")
            translate([0, -e3d_clamp_b_length, 0])
                cube([e3d_clamp_width, e3d_clamp_b_length - e3d_clamp_cut, e3d_clamp_height]);
            
            // red & yellow clamp
            color("cyan")
            translate([0, e3d_clamp_length + e3d_clamp_cut, 0])
                cube([e3d_clamp_width, e3d_clamp_b_length - e3d_clamp_cut, e3d_clamp_height]);
        }
        
        // cable holes
        translate([9.5, 6, -1])
            cylinder(d = 7, h = e3d_clamp_height + 2);
        translate([e3d_clamp_width - 9.5, 6, -1])
            cylinder(d = 7, h = e3d_clamp_height + 2);
        
        // left clamping screw
        translate([e3d_clamp_hole_off, -e3d_clamp_b_length - 1, e3d_clamp_height / 2])
            rotate([-90, 0, 0])
            cylinder(d = e3d_hole_dia, h = x_cutout_width + 2);
        // right clamping screw
        translate([x_cutout_width - e3d_clamp_hole_off, -e3d_clamp_b_length - 1, e3d_clamp_height / 2])
            rotate([-90, 0, 0])
            cylinder(d = e3d_hole_dia, h = x_cutout_width + 2);
        
        // left mounting screw
        translate([-5, e3d_clamp_length / 2, -1])
            cylinder(d = e3d_hole_dia, h = e3d_clamp_height + 2);
        // right mounting screw
        translate([e3d_clamp_width + e3d_clamp_width_add - 5, e3d_clamp_length / 2, -1])
            cylinder(d = e3d_hole_dia, h = e3d_clamp_height + 2);
        
        // bottom mounting screw
        translate([e3d_clamp_width / 2, -e3d_clamp_b_length + 3.5, -1])
            cylinder(d = e3d_hole_dia, h = e3d_clamp_height + 2);
        // top mounting screw
        translate([e3d_clamp_width / 2, e3d_clamp_length + e3d_clamp_b_length - 3.5, -1])
            cylinder(d = e3d_hole_dia, h = e3d_clamp_height + 2);
        
        // red e3d clamp cutout
        translate([(e3d_clamp_width - e3d_v6_dist_x) / 2, e3d_clamp_length, -1])
            cylinder(d = e3d_upper_small_dia + e3d_clamp_dia_add, h = e3d_clamp_height + 2);
        
        // yellow e3d clamp cutout
        translate([(e3d_clamp_width + e3d_v6_dist_x) / 2, e3d_clamp_length, -1])
            cylinder(d = e3d_upper_small_dia + e3d_clamp_dia_add, h = e3d_clamp_height + 2);
        
        // blue e3d clamp cutout
        translate([e3d_clamp_width / 2, 0, -1])
            cylinder(d = e3d_upper_small_dia + e3d_clamp_dia_add, h = e3d_clamp_height + 2);
    }
    
    e3d_v6_triple_fan();
}

module simple_fan() {
    difference() {
        cube([fan_height, fan_width, fan_width]);
        translate([-1, fan_width / 2, fan_width / 2])
            rotate([0, 90, 0])
            cylinder(d = fan_width - 5, h = fan_height + 2);
    }
}

module fan_mount() {
    difference() {
        cube([fan_mount_wall, fan_width, fan_width + x_carriage_wall]);
        
        translate([-1, fan_mount_inset, fan_mount_inset])
            cube([fan_mount_wall + 2, fan_width - (fan_mount_inset * 2), fan_width - (fan_mount_inset * 2)]);
    }
}

module e3d_v6_triple_fan() {
    difference() {
        union() {
            translate([x_carriage_width, (x_carriage_length - fan_width) / 2, -fan_width]) {
                // hotend cooling fan on right side
                %translate([fan_mount_wall, 0, 0])
                    simple_fan();
                
                // hotend cooling fan on left side
                %translate([-x_carriage_width - fan_height - fan_mount_wall, 0, 0])
                    simple_fan();
                
                // fan mount on right side
                color("orange")
                fan_mount();
                
                // fan mount on left side
                color("orange")
                translate([-x_carriage_width - fan_mount_wall, 0, 0])
                    fan_mount();
            }
            
            // fan duct
            if (draw_e3d_fan_duct) {
                color("orange")
                translate([x_carriage_width, (x_carriage_length - fan_width) / 2, 0])
                difference() {
                    fan_duct(fan_width, 0);
                    fan_duct(fan_width, 3);
                }
            }
        }
        
        // mounting holes on carriage
        translate([-fan_mount_wall - fan_height - 1, x_carriage_length / 2, x_carriage_wall / 2])
        for (i = [-1 : 2 : 1]) {
            translate([0, i * ((fan_width / 2) - fan_mount_hole_inset), 0])
                rotate([0, 90, 0])
                cylinder(d = 3.2, h = x_carriage_width + (2 * (fan_height + fan_mount_wall + 1)));
        }
        
        // fan holes (self-tapping)
        translate([-fan_mount_wall - fan_height - 1, x_carriage_length / 2, -fan_width / 2])
        for (i = [-1 : 2 : 1]) {
            for (j = [-1 : 2 : 1]) {
                translate([0, i * ((fan_width / 2) - fan_hole_off), j * ((fan_width / 2) - fan_hole_off)])
                    rotate([0, 90, 0])
                    cylinder(d = 2.7, h = fan_height + fan_mount_wall + 5);
                translate([fan_height + fan_mount_wall + x_carriage_width - 3, i * ((fan_width / 2) - fan_hole_off), j * ((fan_width / 2) - fan_hole_off)])
                    rotate([0, 90, 0])
                    cylinder(d = 2.7, h = fan_height + fan_mount_wall + 5);
            }
        }
    }
}

module fan_duct(fan_width, diff) {
    size = fan_width - diff;
    off = (fan_width - size) / 2;
    difference() {
        translate([0, off, -size - off]) {
            hull() {
                cube([1 + (diff / 10), size, size]);
                translate([-10, 0, 10])
                    cube([1, size, size - 11]);
            }
            hull() {
                translate([-10, 0, 10])
                    cube([1, size, size - 11]);
                translate([-15, -6, 17])
                    cube([1, size + 12, size - 18]);
            }
            hull() {
                translate([-15, -6, 17])
                    cube([1, size + 12, size - 18]);
                translate([-25, -6, 17])
                    cube([1, size + 12, size - 20]);
            }
            hull() {
                translate([-25, -6, 17])
                    cube([1, size + 12, size - 20]);
                translate([-55, -6, 17])
                    cube([1, size + 12, size - 20]);
            }
            hull() {
                translate([-55, -6, 17])
                    cube([1, size + 12, size - 20]);
                translate([-70, 15 - 10, 17])
                        cube([1, size - 12 + 10, size - 20]);
            }
            hull() {
                translate([-70, 15 - 10, 17])
                        cube([1, size - 12 + 10, size - 20]);
                
                translate([-80 - (off / 10), 0, 0])
                    cube([1 + (off / 10), size, size]);
            }
        }
        
        translate([-26, 29.5, -size - 20])
            cylinder(d = e3d_max_dia + 3 - diff, h = 100);
        translate([-26 - e3d_v6_dist_x, 29.5, -size - 20])
            cylinder(d = e3d_max_dia + 3 - diff, h = 100);
        translate([-26 - e3d_v6_dist_x / 2, 29.5 - e3d_v6_dist_y, -size - 20])
            cylinder(d = e3d_max_dia + 3 - diff, h = 100);
    }
}

if (draw_y_carriage) {
    translate([(lm8uu_outer + lm8uu_dia_add) / 2 + y_carriage_rail_support, 0, 0])
    rotate([-90, 0, 0]) {
        // y-bearings
        %translate([0, 0, y_carriage_rail_support])
            lm8uu();
        %translate([0, 0, y_carriage_length - lm8uu_height - y_carriage_rail_support])
            lm8uu();
    }

    // x-rails
    for (i = [y_carriage_len_add : x_rail_dist : x_rail_dist + y_carriage_len_add]) {
        %translate([y_carriage_width + 1, i, 0])
            rotate([0, 90, 0])
            cylinder(d = lm8uu_inner, h = draw_rail_len);
    }

    y_carriage(idler_a_blue, idler_b_blue);

    translate([(2 * y_carriage_width + y_carriage_block_width) + draw_rail_len -5, y_carriage_length, 0])
        rotate([0, 0, 180])
        y_carriage(idler_a_red, idler_b_red);
    
    if (draw_x_carriage) {
        translate([y_carriage_width + y_carriage_block_width + ((draw_rail_len - x_carriage_width) / 2), y_carriage_len_add - x_carriage_len_add, 0])
            x_carriage();
    }
} else if (draw_x_carriage) {
    x_carriage();
}