xyRepRap/lib/extruder.scad

// adapted from https://www.thingiverse.com/thing:1383913

// #######################################################
// ###################### Extruders ######################
// #######################################################

include <rounded.scad>
include <nema.scad>
include <tslot_xy.scad>

draw_extruder = false;

extruder_width = nema17_size;
extruder_depth = 15;
extruder_height_m = 15; // material below motor
extruder_cover_d = 12;

extruder_filament_d = 1.75;

extruder_gear_od = 12; // outer diameter: mk8 = 9, mk7 = 12
extruder_gear_ed = 10.25; // effective diameter: mk8 = 6.75, mk7 = 10.25
extruder_gear_groove_width = 3.5;

fillet = 1.5;

extruder_supports = true;
extruder_brass_tube = false;
extruder_lever_with_switch = true;

// bearing 624
extruder_bearing_od = 13;
extruder_bearing_id = 4;
extruder_bearing_h = 5;

extruder_filament_offset = (extruder_gear_ed + extruder_filament_d) / 2;

echo(extruder_filament_offset=extruder_filament_offset);

bracket_height = 8;
bracket_width = extruder_height_m;
bracket_width_add = 10;
bracket_dist_add = 1;

extruder_bearing_x = extruder_filament_offset + (extruder_filament_d / 2) + (extruder_bearing_od / 2); 

lever_h = 12;

// #######################################################

if (draw_extruder)
    extruder(30, "1", true);

module extruder(slot, id = "", draw_slot = false) {
    translate([-nema17_size / 2 - bracket_dist_add, 0, slot + bracket_height + 10])
    rotate([-90, 0, 0])
        extruder_assembly(id);
    
    color("green")
    extruder_bracket(slot);
    
    if (draw_slot)
    %translate([bracket_height, -100, 0])
        tslot_y(slot, 300);
}

module extruder_bracket(slot) {
    difference() {
        union() {
            translate([bracket_height, 0, slot])
                cube([slot, bracket_width + bracket_width_add, bracket_height]);
            
            cube([bracket_height, bracket_width + bracket_width_add, slot + bracket_height]);
            
            translate([-nema17_size - bracket_dist_add, 0, slot])
                cube([nema17_size + bracket_dist_add, bracket_width, bracket_height]);
        }
        
        translate([bracket_height + slot / 2, (bracket_width + bracket_width_add) / 2, slot - 1])
            cylinder(d = 4.4, h = bracket_height + 2);
        
        translate([-1, (bracket_width + bracket_width_add) / 2, slot / 2])
            rotate([0, 90, 0])
            cylinder(d = 4.4, h = bracket_height + 2);
        
        translate([-bracket_height - 14, 0, slot + bracket_height + 6])
            rotate([-90, 0, 0])
            extruder_screw_holes_main();
    }
}

module extruder_assembly(id = "") {
    color("cyan") extruder_holder();
    color("yellow") extruder_top_plate();
    color("orange") extruder_cover(id); 
    
    if (!extruder_lever_with_switch) {
        color("red")
        extruder_lever();
    } else {
        color("red")
        translate([6, 0, 62.4 - 4.9])
            extruder_lever_switch();
    }

    color("silver", 0.5)
    %extruder_bearing();     
    
    // Filament mockup
    color("blue", 0.25)
    %translate([extruder_filament_offset, 0, -15])
        cylinder(d=extruder_filament_d, h=100, $fn=64);
    
    // NEMA17 mockup
    color("gray")
    %translate([-nema17_size / 2, 40 + 10, extruder_height_m])
        rotate([90, 0, 0])
        nema17(40);
}

module extruder_holder() {
   difference() {
        union() {
            translate([-extruder_width/2, 0, 0])
                rounded_cube(extruder_width, 10, extruder_height_m, 0, fillet, 0);
            
            translate([-extruder_width/2, -6, extruder_height_m])
                rounded_cube(extruder_width, 16, 11, fillet,fillet,fillet);
            
            translate([-extruder_width/2, -6, extruder_height_m-5])
                rounded_cube(extruder_width, 16, 10, 0,0,fillet);
            
            translate([extruder_filament_offset-5,0, extruder_height_m+10])
                cube([10, 7.5, 9]); // tip for flex filament
            
            translate([-12,0, extruder_height_m+10.9])
                cylinder(d2 = 5, d1=8, h=2.1, $fn=64); // spring
        }
        
        translate([-extruder_width/2-0.15, -15, 0.1])
            rounded_cube(extruder_width+0.3, 15, extruder_height_m, fillet,fillet,fillet); 
        
        translate([0,10.1,extruder_height_m+21.5])
            rotate([90,0,0])
            cylinder(d=23, h=2.6, $fn=64);
        
        translate([-12,0, extruder_height_m+11])
            cylinder(r = 1.5, h=20, $fn=64, center=true); //spring
        
        //hotend mount
        translate([extruder_filament_offset,0, 0]) {
            extruder_hotend_mount();
            translate([-5.1,-10,20])
                cube([10.2, 10, 20]);
        }
        
        //motor screws
        translate([-31/2, -6, extruder_height_m+6])
        rotate([-90, 0, 0]) {
            cylinder(r = 1.6, h = 25,  $fn=32);
            cylinder(r = 3.1, h = 6,  $fn=32, center=true);
        }
        translate([ 31/2, -6, extruder_height_m+6])
        rotate([-90, 0, 0]) {
            cylinder(r = 1.6, h = 25,  $fn=32);
            cylinder(r = 3.1, h = 6,  $fn=32, center=true);
        }

        extruder_screw_holes_main();
        extruder_flex_guide();
    }  
    
    // tip extruder_supports
    if (extruder_supports)
        for (xx =[-5.2, -2.5, 0, 2.5, 4.7])
            translate([extruder_filament_offset+xx, 7.6, extruder_height_m+11.4])
                cube ([0.55, 2.4, 8]);
}    

module extruder_top_plate() {
    difference() {
        hull() {
            translate([-14.5, 6, extruder_height_m+39.5]) rotate([-90, 0, 0]) cylinder(r=3, h=4, $fn=32);            
            translate([-18, 6, extruder_height_m+36]) rotate([-90, 0, 0]) cylinder(r=3, h=4, $fn=32);
            translate([-18, 6, extruder_height_m+29]) rotate([-90, 0, 0]) cylinder(r=3, h=4, $fn=32);
            translate([ 31/2, 6, extruder_height_m+37]) rotate([-90, 0, 0]) cylinder(r = 5.5, h=4, $fn=32);  
            translate([18, 6, extruder_height_m+29]) rotate([-90, 0, 0]) cylinder(r=3, h=4, $fn=32);
        }

        
        translate([0,10.1,extruder_height_m+21.5]) rotate([90,0,0]) cylinder(d=24, h=5, $fn=64);
        
        //mount holes
        translate([-31/2, 5.9, extruder_height_m+37]) rotate([-90, 0, 0]) { 
            cylinder(r = 1.6, h = 5,  $fn=32);
            cylinder(r = 3.5, h = 2,  $fn=32);            
        }
        translate([ 31/2, 5.9, extruder_height_m+37]) rotate([-90, 0, 0]) {
            hd = extruder_brass_tube ? 4.2 : 3;
            cylinder(d = hd, h = 5,  $fn=32);
        }
    }
}

module extruder_lever() {
    translate([0, 0, extruder_height_m])
    difference() {
        union() {
            hull() {
                translate([-8, -(lever_h/2), 32.5])
                    rounded_cube(38-14+fillet, lever_h, 10, noback = true);
                
                translate([-13, -(lever_h/2), 39.5])
                    rotate([-90, 0, 0])
                    rounded_cylinder(3, lever_h-1, fillet, true, true);
                
                translate([-13, -(lever_h/2), 35.5])
                    rotate([-90, 0, 0])
                    rounded_cylinder(3, lever_h-1, fillet, true, true);
            }
            
            // lever tip
            hull() {
                translate([-13, -(lever_h/2), 39.5])
                    rotate([-90, 0, 0])
                    rounded_cylinder(3, lever_h-1, fillet, true, true);
                
                translate([-13, -(lever_h/2), 35.5])
                    rotate([-90, 0, 0])
                    rounded_cylinder(3, lever_h-1, fillet, true, true);
                
                translate([-18.5, -(lever_h/2), 35.5])
                    rotate([-90, 0, 0])
                    rounded_cylinder(3, lever_h-1, fillet, true, true);
                
                translate([-25, -(lever_h/2), 39.5])
                    rotate([-90, 0, 0])
                    rounded_cylinder(3, lever_h-1, fillet, true, true);
            }
            
            // bearing holder arm
            hull() {
                translate([extruder_bearing_x-extruder_bearing_od/2+1, -(lever_h/2), 21.5]) 
                    rounded_cube(extruder_bearing_od/2, lever_h, 15);
                
                translate([ 31/2, -(lever_h/2), 37])
                    rotate([-90, 0, 0])
                    rounded_cylinder(r = 5.5, h = lever_h, rrnd=fillet,  $fn=64);
                
                translate([extruder_bearing_x, 0, 21.5])
                    rotate([-90, 0, 0])
                    rounded_cylinder((extruder_bearing_od-2)/2, lever_h, center=true);
                
                if (extruder_bearing_od <= 16)
                    translate([min((extruder_bearing_x+2),20-(extruder_bearing_od-2)/2), 0, 21.5])
                        rotate([-90, 0, 0])                
                        rounded_cylinder((extruder_bearing_od-2)/2, lever_h, center=true);  
            }

            //spring tip
            translate([-12,0, 30.5]) cylinder(d1 = 5, d2=8, h=2.1, $fn=64);
            
            //filament tip
            translate([extruder_filament_offset,0, 30])
                cylinder(d1 = 6, d2=10, h=3, $fn=64); 
        }
        
        translate([extruder_filament_offset, 0, 42.5-3])
            cylinder(d1 = 4, d2=5, h=3, $fn=64);
        
        //mounting hole
        translate([ 31/2, -(lever_h/2), 37])
        rotate([-90, 0, 0]) {
            hd = extruder_brass_tube ? 4.2 : 3;
            cylinder(d=hd, h = 20,  $fn=32);
            cylinder(d=8, h = 7,  $fn=32, center=true);
        }
            
        translate([extruder_bearing_x, 0, 21.5])
        rotate([-90, 0, 0]) {
            difference() {
                cylinder(d=extruder_bearing_od+2, h=extruder_bearing_h+0.5, $fn=64, center=true);
                
                difference() {
                    cylinder(d=extruder_bearing_id+(extruder_bearing_od-extruder_bearing_id)/3, h=extruder_bearing_h+0.5, $fn=64, center=true);
                    
                    cylinder(d=extruder_bearing_od, h=extruder_bearing_h+0.1, $fn=64, center=true);
                }
            }
            
            cylinder(d=extruder_bearing_id*0.95, h=20, $fn=64, center=true);
        }

        //translate([extruder_filament_offset, -(extruder_bearing_h)/2, 0]) cube([20, extruder_bearing_h+0.1, 21.5]); 
        
        // filament hole
        translate([extruder_filament_offset,0, 25])
            cylinder(d=4.2, h=20, $fn=64);
        
        // spring screw
        translate([-12,0, 32.5]) { 
            cylinder(r = 1.6, h=30, $fn=64, center=true);
            
            translate([-3, -3.3, 3])
                cube([6, 10, 3.0]);
        }
    }       
}

module extruder_switch_model() {
    $fn = 15;
    
    difference() {
        union() {
            cube([12.8, 5.8, 6.2]);
            
            translate([-0.5, (5.8 - 4) / 2, 6.2 + 2.5])
                rotate([0, 11, 0])
                cube([13.5, 4.0, 0.3]);
            
            translate([0.9, 5.8 / 2, -4.0])
                cylinder(d = 0.8, h = 4.0);
            translate([12.8 - 0.9, 5.8 / 2, -4.0])
                cylinder(d = 0.8, h = 4.0);
            translate([12.8 / 2, 5.8 / 2, -4.0])
                cylinder(d = 0.8, h = 4.0);
        }
        
        translate([3.1, 5.9, 1.0])
            rotate([90, 0, 0])
            cylinder(d = 2.0, 6.0);
        translate([3.1 + 6.5, 5.9, 1.0])
            rotate([90, 0, 0])
            cylinder(d = 2.0, 6.0);
    }
}

module extruder_lever_switch() {
    $fn = 20;
    
    translate([-6, 0, extruder_height_m - 77.4 + 4.9])
        extruder_lever();
    
    %translate([-9 + 0.5, 3, 0])
        rotate([180, -90, 0])
        extruder_switch_model();
    
    difference() {
        cylinder(d = 9.0, h = 13.0);
        
        translate([0, 0, -0.1])
            cylinder(d1 = 5.1, d2 = 2.5, h = 13.2);
        
        translate([-5.5, -15, 0])
            cube([5, 30, 13.1]);
        
        translate([-9 + 0.5, 3, 0])
            rotate([180, -90, 0])
            extruder_switch_model();
    }
    
    difference() {
        union() {
            translate([-11, 3.0, 0])
                cube([11, 1.5 + 1.5, 13]);
            translate([-11, -6.0, -3])
                cube([11, 1.5 + 1.5, 13 + 3]);
        }
        
        for (off = [-1 : 0.1 : 1]) {
            translate([-7.5 + off, 10, 3.1])
                rotate([90, 0, 0])
                cylinder(d = 2.5, 20.0);
            translate([-7.5 + off, 10, 9.6])
                rotate([90, 0, 0])
                cylinder(d = 2.5, 20.0);
        }
    }
}

module extruder_cover(id = "") {
    difference() {
        union() {
            translate([-extruder_width/2, -extruder_cover_d, 0])
                rounded_cube(extruder_width, extruder_cover_d, extruder_height_m, fillet,fillet,fillet);        
            translate([extruder_filament_offset-5,-6, extruder_height_m-1])
                cube ([10, 6, 20]);
           
            // add id number
            translate([-6, -extruder_cover_d + 1, 12])
                rotate([90, 90, 0])
                linear_extrude(height = 3)
                text(id, 12, font = "Liberation Sans:style=Bold");
        }
        
        translate([extruder_filament_offset,0,0])
            extruder_hotend_mount();
        
        extruder_screw_holes_main();
        extruder_flex_guide();
    }
}

module extruder_hotend_mount() {
    cylinder(d=4.2, h=46, $fn=64);
    cylinder(d=5.8, h=8, $fn=64);
}

module extruder_screw_holes_main() {
    translate([extruder_width/2-5.5, -extruder_cover_d, extruder_height_m/2]) rotate([-90, 0, 0]) {
        cylinder(r = 1.6, h = 50,  $fn=32);
        cylinder(r = 3.2, h = 11,  $fn=32, center=true);
    } 
    translate([-extruder_width/2+5.5, -extruder_cover_d, extruder_height_m/2]) rotate([-90, 0, 0]) {
        cylinder(r = 1.6, h = 50,  $fn=32);
        cylinder(r = 3.2, h = 11,  $fn=32, center=true);
    }    
    translate([extruder_width/2-5.5, extruder_depth-4, extruder_height_m/2]) rotate([-90, 0, 0]) cylinder( d = 6.6, h = 4.1, $fn=6);
    translate([-extruder_width/2+5.5, extruder_depth-4, extruder_height_m/2]) rotate([-90, 0, 0]) cylinder( d = 6.6, h = 4.1, $fn=6);
}

module extruder_flex_guide() {
    difference() {
        translate([0, -10, extruder_height_m+6+31/2]) rotate([-90, 0, 0]) cylinder(d=extruder_gear_od+1, h=20, $fn=64);
        intersection() {
            translate([0, -10, extruder_height_m+6+31/2]) rotate([-90, 0, 0]) cylinder(d=extruder_gear_od+1, h=20, $fn=64);
            translate([0, 0, extruder_height_m+6+31/2]) rotate([90, 0, 0]) rotate_extrude($fn=64) {
                translate([extruder_gear_ed/2 + (extruder_gear_od - extruder_gear_ed)/2 +0.5, 0, 0])
                resize([(extruder_gear_od-extruder_gear_ed), extruder_gear_groove_width]) circle(d = extruder_gear_od-extruder_gear_ed, $fn=64);
            }
        }
    }
    
    translate([0, 3.5, extruder_height_m+6+31/2]) rotate([-90, 0, 0]) cylinder(d1=extruder_gear_od+1, d2 = extruder_gear_od+2, h=0.55, $fn=64);
    translate([0, 4, extruder_height_m+6+31/2]) rotate([-90, 0, 0]) cylinder(d=extruder_gear_od+2, h=20, $fn=64);
    
    translate([0, -3.5, extruder_height_m+6+31/2]) mirror([0,1,0]) rotate([-90, 0, 0]) cylinder(d1=extruder_gear_od+1, d2 = extruder_gear_od+2, h=0.55, $fn=64);
    translate([0, -4, extruder_height_m+6+31/2]) mirror([0,1,0]) rotate([-90, 0, 0]) cylinder(d=extruder_gear_od+2, h=20, $fn=64);    

    translate([extruder_bearing_od/2 + extruder_gear_ed/2 + extruder_filament_d,-10, extruder_height_m+6+31/2]) {
        rotate([-90, 0, 0]) cylinder(d=extruder_bearing_od+1, h=20, $fn=64);
        translate([0,0,-(extruder_bearing_od+1)/2]) cube([(extruder_bearing_od+1)/2, 20, (extruder_bearing_od+1)/2]);
    }
}

module extruder_bearing() {
    translate([extruder_bearing_od/2 + extruder_gear_ed/2+extruder_filament_d, 0, extruder_height_m+6+31/2]) {
        difference() {
            rotate([-90, 0, 0]) cylinder(d=extruder_bearing_od, h=extruder_bearing_h, $fn=64, center=true);
            rotate([-90, 0, 0]) cylinder(d=extruder_bearing_id, h=extruder_bearing_h+0.1, $fn=64, center=true);
        }
    }   
}