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- /*
- * Trackball
- * Copyright 2022 Thomas Buck - thomas@xythobuz.de
- *
- * Required parts:
- * - 1x Raspberry Pi Pico
- * - 4x Cherry MX compatible switches and keycaps
- * - 1x Billard ball, diameter 38mm
- * - 3x Si3N4 static bearing balls, diameter 3mm
- * - 1x PMW3360 sensor with breakout board
- * - 8x M2 screw, length 5mm
- * - 8x M2 heat melt insert, length 4mm
- *
- * For the PMW3360 breakout board get this:
- * https://github.com/jfedor2/pmw3360-breakout
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * See <http://www.gnu.org/licenses/>.
- */
-
- // https://www.thingiverse.com/thing:421524
- use <external/cherry_mx.scad>
-
- // https://www.printables.com/model/210898-raspberry-pi-pico-case
- use <external/pico_case.scad>
-
- // ######################
- // ## Rendering Select ##
- // ######################
-
- //ball_and_roller();
- pico_wrap();
- //sensor();
- //mx_switch_cutout(wall);
- //mx_switch_test();
- //roller_mount_test();
-
- //roller_holder();
- //roller_mount_tri();
-
- trackball_top();
- trackball_bottom();
-
- //assembly();
- //print();
-
- // #######################
- // #### Configuration ####
- // #######################
-
- $fn = 200;//42;
-
- ball_dia = 38.0;
- roller_dia = 3.0;
-
- roller_ball_h = ball_dia / 2 - 5;
- roller_count = 3;
-
- wall = 3.0;
- $c = 0.1;
- $e = 0.01;
-
- left_hand_version = false;
-
- cut_roller_holder = false;
- draw_supports = false;
- draw_ball_roller = true;
- draw_switches = true;
- draw_sensor = true;
- use_external_pico_model = true;
-
- // #######################
- // ## Raspberry Pi Pico ##
- // #######################
-
- pico_w = 21;
- pico_l = 51;
- pico_d = 1.0;
- pico_hole_d = 2.1;
- pico_hole_x = 4.8;
- pico_hole_y = 2.0;
- pico_hole_d_x = 11.4;
- pico_hole_d_y = pico_l - 2 * pico_hole_y;
- pico_usb_w = 8.0;
- pico_usb_h = 2.8;
- pico_usb_d = 6.0;
- pico_usb_off = 1.3;
-
- // ######################
- // ### PMW3360 Sensor ###
- // ######################
-
- // https://github.com/jfedor2/pmw3360-breakout
- sensor_w = 22;
- sensor_l = 34;
- sensor_pcb_h = 1.6;
- sensor_hole_dia = 2.2;
- sensor_hole_off_x = 3.0;
- sensor_hole_off_y = 3.0;
- sensor_hole_dist_x = 16.0;
- sensor_hole_dist_y = 24.5;
- sensor_cut_w = 8.0 + 0.5;
- sensor_cut_h = 17.26;
- sensor_cut_off_x = 7.0 - 0.25;
- sensor_cut_off_y = 5.27;
- sensor_cut_edge_to_pin1 = 2.75;
- sensor_edge_to_pin1 = 1.52;
-
- sensor_ball_to_lens_top = 2.4;
- sensor_ball_to_chip_bottom = 9.81;
-
- sensor_chip_w = 9.1;
- sensor_chip_l = 16.2;
- sensor_chip_h = 2.21;
-
- sensor_pin_w = 0.5;
- sensor_pin_h = 4.51;
- sensor_pin_d = 0.2;
- sensor_pin_dist = 10.7;
- sensor_pin_off_top = 0.5;
- sensor_pin_pitch = 0.89;
-
- sensor_pin1_to_optical_center = 5.66;
-
- sensor_lens_cutout_r = 2.0;
- sensor_lens_cutout_w = 4.0;
- sensor_lens_cutout_growth = 0.25;
- sensor_lens_cutout_to_chip = 6.71 - 1.60;
- sensor_lens_baseplate_h = 2.40;
-
- sensor_lens_d = 19.0 + 1.0;
- sensor_lens_w = 21.35 + 0.2;
- sensor_lens_off = 10.97;
-
- // ######################
- // ## MX Switch Cutout ##
- // ######################
-
- // https://geekhack.org/index.php?topic=70654.0
- mx_co_w = 14.0;
- mx_co_w_add = 0.8;
- mx_co_h = 14.0;
- mx_co_keycap_w = mx_co_w + 2.5*2;
- mx_co_keycap_h = mx_co_h + 2.5*2;
- mx_co_h_off_1 = 1.0;
- mx_co_h_off_2 = 3.5;
- mx_co_h_off_3 = mx_co_h - 2 * (mx_co_h_off_1 + mx_co_h_off_2);
- mx_co_r = 0.4;
-
- // https://geekhack.org/index.php?topic=71550.0
- mx_co_th = 1.5 - 0.1;
- mx_co_b_add = 1.0;
- mx_co_b_w = mx_co_w + mx_co_b_add;
- mx_co_b_h = mx_co_h + mx_co_b_add;
-
- mx_travel = 3.9;
-
- // ######################
- // ### Implementation ###
- // ######################
-
- base_dia = 62;
-
- grub_screw_dia = 2.8;
- grub_channel_dia = 4.0;
-
- roller_thread_dia = roller_dia + 5.0;
- roller_h = roller_dia + 7.0;
- roller_ball_h_off = 0.4;
- roller_ball_hold_off = 0.5;
- roller_thread_hole = roller_dia - 1;
- roller_small_hole = sphere_r_at_h(roller_ball_hold_off, roller_dia / 2) * 2;
-
- roller_ridge_h = 1.5;
- roller_mount_angle_off = 90-5;
- roller_mount_dia = roller_thread_dia + 2.0;
-
- ball_h = 15; // todo
-
- switch_test_w = 25;
-
- roller_mount_holder_gap = 0.8;
- sensor_pcb_mount_gap = 2.0;
-
- sensor_pcb_support_h = 1.6 + 3.4;
- // rotate translate
- sw = [ // x z_pre_T z_post_T
- [ [-5, 0, -33 * (left_hand_version ? -1 : 1)], [0,-base_dia / 2 - 2,-14.5]],// thumb
- [ [-5, -15, 3 * (left_hand_version ? -1 : 1)], [0,-base_dia / 2 - 2,-14.5]],// thumb
- //[ [-5, 0, -70 * (left_hand_version ? -1 : 1)], [0,-base_dia / 2 - 0,-14.5]],// thumb
- [ [-5, -15, 140 * (left_hand_version ? -1 : 1)], [0,-base_dia / 2 - 3,-14.5]],// middle
- [ [-5, 0, 100 * (left_hand_version ? -1 : 1)], [0,-base_dia / 2 - 2,-14.5]],// ring
- ];
-
- sw_mount_w = mx_co_w + 7;
- sw_mount_co_l = 10;
-
- bottom_base_wall = wall + 0.5;
- bottom_base_below_zero = bottom_base_wall + 4.5;
-
- pico_co_w = pico_w + 1;
- pico_co_l = pico_l + 1;
-
- reset_button_dia = 4.0;
- reset_button_off_x = 7;
- reset_button_off_y = 12.15;
-
- pico_support_w = 6.5;
- pico_support_l = 5;
-
- pico_screw_depth = 6;
- pico_screw_d = 1.8;
-
- usb_cutout_grow_l = 10;
- usb_cutout_grow_x = 20;
- usb_cutout_grow_y = 10;
- usb_cutout_w_add = 1;
- usb_cutout_h_add = 0.6;
-
- assembly_dist = 20;
-
- roller_holder_sider_cut = 1.5;
- roller_holder_h_compensation = -0.1;
-
- bottom_add_wall = 4;
-
- screw_dia = 3.2;
- screw_off = base_dia / 2 - 10;
- screw_head_d = 6.0;
- screw_head_h = 3.5;
- screw_angles = [ 15, -15, 180 + 15, 180 - 15 ];
- screw_insert_dia = 4.8;
- screw_insert_h = 6.0;
-
- function sphere_r_at_h(h, r) = r * sin(acos(h / r));
- function sphere_angle_at_rh(h, r) = acos(h / r);
-
- module mx_switch_cutout(h) {
- translate([-mx_co_w / 2 - mx_co_w_add, -mx_co_h / 2, 0]) {
- linear_extrude(h + 1) {
- translate([mx_co_w_add, 0]) {
- square([mx_co_w, mx_co_h]);
-
- for (x = [mx_co_r / 2, mx_co_w - mx_co_r / 2])
- for (y = [mx_co_r / 2, mx_co_h - mx_co_r / 2])
- translate([x, y])
- circle(r = mx_co_r);
- }
-
- for (x = [0, mx_co_w + mx_co_w_add])
- for (y = [0, mx_co_h_off_2 + mx_co_h_off_3])
- translate([x, mx_co_h_off_1 + y, 0])
- square([mx_co_w_add, mx_co_h_off_2]);
- }
-
- translate([mx_co_w_add - mx_co_b_add / 2, -mx_co_b_add / 2, -1])
- cube([mx_co_b_w, mx_co_b_h, h - mx_co_th + 1]);
-
-
- }
-
-
-
- translate([-mx_co_keycap_w/2,-mx_co_keycap_h/2, h])
- cube([mx_co_keycap_w, mx_co_keycap_h, 50]);
- }
-
- module mx_switch_test() {
- difference() {
- translate([-switch_test_w / 2, -switch_test_w / 2, 0])
- cube([switch_test_w, switch_test_w, wall]);
-
- mx_switch_cutout(wall);
-
- translate([0, -switch_test_w / 2 + 1, wall - 1.0])
- linear_extrude(1.1)
- text("switch test", size = 3, halign = "center");
- }
-
- %translate([0, 0, wall])
- rotate([0, 0, 180])
- mx_switch($t);
- }
-
- module pico_own() {
- translate([-pico_w / 2, -pico_l / 2, 0])
- difference() {
- union() {
- color("green")
- cube([pico_w, pico_l, pico_d]);
-
- translate([(pico_w - pico_usb_w) / 2, pico_l - pico_usb_d + pico_usb_off, pico_d])
- cube([pico_usb_w, pico_usb_d, pico_usb_h]);
- }
-
- for (x = [0, pico_hole_d_x])
- for (y = [0, pico_hole_d_y])
- translate([pico_hole_x + x, pico_hole_y + y, -1])
- cylinder(d = pico_hole_d, h = pico_d + 2);
- }
- }
-
- module pico_wrap() {
- translate([0,0,3.9])
- rotate([0,180,0])
- if (use_external_pico_model)
- translate([-pico_w / 2, -pico_l / 2, 0])
- pico();
- else
- pico_own();
- }
-
- module sensor_lens_cutout_intern() {
- cylinder(d = sensor_lens_cutout_r * 2, h = $e);
-
- translate([-sensor_lens_cutout_r, 0, 0])
- cube([sensor_lens_cutout_r * 2, sensor_lens_cutout_w, $e]);
- }
-
- module rounded_cube(x, y, z, r) {
- hull()
- for (tx = [r, x - r])
- for (ty = [r, y - r])
- translate([tx, ty, 0])
- cylinder(d = r * 2, h = z);
- }
-
- module sensor_lens_cutout() {
- translate([0, 0, sensor_lens_cutout_to_chip])
- hull() {
- translate([0, 0, sensor_lens_baseplate_h - $e])
- sensor_lens_cutout_intern();
-
- scale(1 + sensor_lens_cutout_growth * sensor_lens_baseplate_h)
- sensor_lens_cutout_intern();
- }
-
- translate([-sensor_lens_d / 2, -sensor_lens_w + sensor_lens_off, 0])
- rounded_cube(sensor_lens_d, sensor_lens_w, sensor_lens_cutout_to_chip, 6);
-
- translate([-3 / 2, -sensor_lens_w + sensor_lens_off - 0.5, 0])
- cube([3, 0.5, sensor_lens_cutout_to_chip]);
- }
-
- module sensor() {
- translate([-sensor_w / 2, -sensor_l / 2, 0])
- difference() {
- color("green")
- cube([sensor_w, sensor_l, sensor_pcb_h]);
-
- translate([sensor_cut_off_x, sensor_cut_off_y, -1])
- cube([sensor_cut_w, sensor_cut_h, sensor_pcb_h + 2]);
-
- for (x = [0, sensor_hole_dist_x])
- for (y = [0, sensor_hole_dist_y])
- translate([sensor_hole_off_x + x, sensor_hole_off_y + y, -1])
- cylinder(d = sensor_hole_dia, h = sensor_pcb_h + 2);
- }
-
- color("#303030")
- translate([-sensor_chip_w / 2, -sensor_l / 2 - sensor_chip_l + sensor_edge_to_pin1 + sensor_cut_off_y + sensor_cut_h - sensor_cut_edge_to_pin1, -sensor_chip_h])
- cube([sensor_chip_w, sensor_chip_l, sensor_chip_h]);
-
- translate([0, -sensor_l / 2 - 15 * sensor_pin_pitch + sensor_cut_off_y + sensor_cut_h - sensor_cut_edge_to_pin1, 0])
- for (p = [0 : 15])
- translate([0, p * sensor_pin_pitch, 0])
- for (x = [-sensor_pin_dist / 2, sensor_pin_dist / 2])
- if (((p % 2 == 0) && (x < 0))
- || ((p % 2 == 1) && (x > 0)))
- translate([-sensor_pin_d / 2 + x, -sensor_pin_w / 2, -sensor_chip_h + sensor_pin_off_top])
- cube([sensor_pin_d, sensor_pin_w, sensor_pin_h]);
-
- translate([0, -sensor_l / 2 + sensor_cut_off_y + sensor_cut_h - sensor_cut_edge_to_pin1 - sensor_pin1_to_optical_center, 0]) {
- color("cyan")
- translate([0, 0, -sensor_chip_h + 1])
- cylinder(d = 0.2, h = sensor_ball_to_chip_bottom - 1);
-
- %color("blue")
- sensor_lens_cutout();
- }
- }
- module ball_and_roller() {
- color("red")
- sphere(d = ball_dia, $fn = $fn);
-
- for (r = [0 : roller_count - 1])
- rotate([0, 0, roller_mount_angle_off + 360 / roller_count * r])
- translate([sphere_r_at_h(roller_ball_h - ball_dia / 2, ball_dia / 2), 0, -ball_dia / 2 + roller_ball_h])
- rotate([0, 180 + sphere_angle_at_rh(roller_ball_h - ball_dia / 2, ball_dia / 2), 0])
- translate([0, 0, -roller_dia / 2])
- roller_holder();
- }
-
- module roller_holder() {
- translate([0, 0, -roller_h + roller_dia / 2])
- difference() {
- color("magenta")
- union() {
- translate([0, 0, roller_h-roller_dia/2 + roller_ball_h_off-3])
- cylinder(d1 = roller_mount_dia, d2=roller_dia+1, h = 3);
-
- cylinder(d = roller_mount_dia, h = roller_h-roller_dia/2 + roller_ball_h_off-3);
- }
-
- translate([-roller_mount_dia / 2 - 1, roller_mount_dia / 2 - roller_holder_sider_cut, -1])
- cube([roller_mount_dia + 2, roller_mount_dia / 2 + 1, roller_h + 2]);
-
- translate([0, 0, -$e])
- cylinder(d = roller_thread_hole, h = $e+ roller_h - roller_dia / 2 + roller_ball_h_off + roller_ball_hold_off);
-
- translate([0, 0, roller_h - roller_dia / 2 + roller_holder_h_compensation])
- sphere(d = roller_dia, $fn = $fn);
-
- if (cut_roller_holder)
- translate([-roller_thread_dia / 2 - 1, -roller_thread_dia, -1])
- cube([roller_thread_dia + 2, roller_thread_dia, roller_h + 2]);
- }
-
- %color("blue")
- sphere(d = roller_dia, $fn = $fn);
- }
-
- module roller_mount() {
- translate([0, 0, -1-roller_h + roller_dia / 2]) {
- difference() {
- cylinder(d=roller_mount_dia+wall,h=roller_h/2);
-
- translate([0, 0, 1])
- cylinder(d=roller_mount_dia+$c*2,h=roller_h/2+$e);
-
- if (cut_roller_holder)
- translate([-roller_thread_dia / 2 - 1, -roller_thread_dia, -1])
- cube([roller_thread_dia + 2, roller_thread_dia, roller_h + 2]);
- }
- }
- }
-
- module roller_mount_test() {
- roller_holder();
- roller_mount();
- }
-
- module roller_mount_tri_hull() {
- for (r = [0 : roller_count - 1])
- rotate([0, 0, roller_mount_angle_off + 360 / roller_count * r])
- translate([sphere_r_at_h(roller_ball_h - ball_dia / 2, ball_dia / 2), 0, -ball_dia / 2 + roller_ball_h])
- rotate([0, 180 + sphere_angle_at_rh(roller_ball_h - ball_dia / 2, ball_dia / 2), 0])
- translate([0, 0, -roller_h])
- cylinder(d = roller_mount_dia + wall + 1, h = roller_h - 3);
-
- translate([0, 0, -ball_dia / 2 - 11])
- cylinder(d = base_dia, h = $e);
- }
-
- module roller_mount_tri_body() {
- // space for roller holder
- for (r = [0 : roller_count - 1])
- rotate([0, 0, roller_mount_angle_off + 360 / roller_count * r])
- translate([sphere_r_at_h(roller_ball_h - ball_dia / 2, ball_dia / 2), 0, -ball_dia / 2 + roller_ball_h])
- rotate([0, 180 + sphere_angle_at_rh(roller_ball_h - ball_dia / 2, ball_dia / 2), 0])
- translate([0, 0, -roller_h])
- cylinder(d = roller_mount_dia + roller_mount_holder_gap, h = ball_dia / 2 + roller_h);
-
- // room for ball itself
- sphere($fn = $fn * 2, d = ball_dia + $c * 2 + 4);
-
- // grub screws
- for (r = [0 : roller_count - 1])
- rotate([0, 0, roller_mount_angle_off + 360 / roller_count * r])
- translate([sphere_r_at_h(roller_ball_h - ball_dia / 2, ball_dia / 2), 0, -ball_dia / 2 + roller_ball_h])
- rotate([0, 180 + sphere_angle_at_rh(roller_ball_h - ball_dia / 2, ball_dia / 2), 0])
- translate([0, 0, -roller_h/2])
- rotate([0,-90,0])
- translate([-2, 0, 2]) {
- cylinder(d = grub_screw_dia, h = ball_dia);
-
- translate([0, 0, roller_mount_dia / 4 + wall])
- cylinder(d = grub_channel_dia, h = ball_dia);
- }
-
- // sensor lens
- translate([0, 0, -ball_dia / 2 - ball_h])
- translate([0, sensor_l / 2 - sensor_cut_off_y - sensor_cut_h + sensor_cut_edge_to_pin1 + sensor_pin1_to_optical_center, ball_h + sensor_chip_h - sensor_ball_to_chip_bottom])
- translate([0, -sensor_l / 2 + sensor_cut_off_y + sensor_cut_h - sensor_cut_edge_to_pin1 - sensor_pin1_to_optical_center, 0])
- sensor_lens_cutout();
-
- // sensor pcb
- translate([-1, -1, -ball_dia / 2 - ball_h])
- translate([0, sensor_l / 2 - sensor_cut_off_y - sensor_cut_h + sensor_cut_edge_to_pin1 + sensor_pin1_to_optical_center, ball_h + sensor_chip_h - sensor_ball_to_chip_bottom])
- translate([-sensor_w / 2, -sensor_l / 2, -10])
- cube([sensor_w + 2, sensor_l + 2, sensor_pcb_h + 10 + sensor_pcb_mount_gap]);
- }
-
- module roller_mount_sensor_pcb_support() {
- translate([-sensor_w / 2, -sensor_l / 2, sensor_pcb_h])
- translate([0, 0, -ball_dia / 2 - ball_h])
- translate([0, sensor_l / 2 - sensor_cut_off_y - sensor_cut_h + sensor_cut_edge_to_pin1 + sensor_pin1_to_optical_center, ball_h + sensor_chip_h - sensor_ball_to_chip_bottom])
- for (x = [0, sensor_hole_dist_x])
- for (y = [0, sensor_hole_dist_y])
- translate([sensor_hole_off_x + x, sensor_hole_off_y + y, 0])
- difference() {
- union() {
- color("magenta")
- cylinder(d = sensor_hole_dia + 1.5, h = sensor_pcb_mount_gap);
-
- if (draw_supports)
- color("black")
- translate([0, 0, -sensor_pcb_support_h])
- cylinder(d = sensor_hole_dia + 0.5, h = sensor_pcb_support_h);
- }
-
- cylinder(d = sensor_hole_dia - 0.2, h = sensor_pcb_mount_gap + 1);
- }
-
- if (draw_supports)
- color("black")
- for (x = [-5, 0, 5])
- for (y = [-8, 0, 6.5])
- if (((x == 0) && (y != 0)) || ((x != 0) && (y == 0)))
- translate([x, y + 2, -30])
- cylinder(d = sensor_hole_dia + 0.5, h = 8.5);
-
- if (draw_sensor)
- %translate([0, 0, -ball_dia / 2 - ball_h])
- translate([0, sensor_l / 2 - sensor_cut_off_y - sensor_cut_h + sensor_cut_edge_to_pin1 + sensor_pin1_to_optical_center, ball_h + sensor_chip_h - sensor_ball_to_chip_bottom])
- sensor();
- }
-
- // TODO holes for pcb screws not going into body!!
-
- module roller_mount_tri() {
- if (draw_ball_roller)
- %ball_and_roller();
-
- difference() {
- hull()
- roller_mount_tri_hull();
-
-
- roller_mount_tri_body();
-
- // TODO test cable cutout
- translate([-6, 0, -30.1])
- cube([12, 50, 2]);
-
- if (cut_roller_holder)
- translate([0, -base_dia / 2 - 1, -40])
- cube([base_dia / 2 + 1, base_dia + 2, 40]);
- }
-
- roller_mount_sensor_pcb_support();
- }
-
- module fully_rounded_cube(p,r,center) {
- for(x=[r,p[0]-r],
- y=[r,p[1]-r],
- z=[r,p[2]-r]
- ){
- translate([x,y,z])
- sphere(r,$fn=$fn/8);
- }
- }
- module trackball_top() {
- translate([0, 0, ball_dia / 2 + ball_h]) {
- if (draw_ball_roller)
- %ball_and_roller();
-
- difference() {
- color("orange")
- hull() {
- r=4;
- roller_mount_tri_hull();
- for ( i = [0:len(sw)-1] ){
- rotate([0,0,sw[i][0][2]])
- translate(sw[i][1])
- rotate([90+sw[i][0][0],0,sw[i][0][1]])
- translate([-sw_mount_w/2-r, -sw_mount_w/2-r, -r-r/2])
- fully_rounded_cube([sw_mount_w+r*2, sw_mount_w+r*2, 0], r);
- }
- }
-
- roller_mount_tri_body();
-
- if (cut_roller_holder)
- translate([0, -base_dia / 2 - 1, -40])
- cube([base_dia / 2 + 1, base_dia + 2, 40]);
-
-
- for ( i = [0:len(sw)-1] ){
- rotate([0,0,sw[i][0][2]])
- translate(sw[i][1])
- rotate([90+sw[i][0][0],0,sw[i][0][1]])
- translate([0, 0, -sw_mount_co_l]) {
- mx_switch_cutout(sw_mount_co_l + 1);
-
- translate([0, 0, 2])
- rotate([90, 0, 0])
- cylinder(d = 4, h = 20);
-
- rotate([0,-sw[i][0][1],0])
- translate([0,-15,3])
- rotate([0,180,0])
- cylinder(d=3,h=40);
- }
- }
-
-
- for (r = screw_angles)
- rotate([0, 0, r])
- translate([screw_off, 0, -ball_dia / 2 - 11 -1]) {
- cylinder(d = screw_insert_dia, h = screw_insert_h + 1);
- }
-
- for (x = [0, pico_hole_d_x])
- for (y = [0, pico_hole_d_y])
- rotate([0,0,0])
- translate([-pico_w / 2, -pico_l / 2, -25])
- translate([pico_hole_x + x, pico_hole_y + y, -pico_d - pico_screw_depth])
- cylinder(d = pico_screw_d, h = pico_d + pico_screw_depth + 1);
-
- rotate([0, 180, 0])
- translate([-pico_w / 2, -pico_l / 2, 0])
- translate([(pico_w - pico_usb_w) / 2, pico_l - 1 + pico_usb_off, 30])
- usb_cutout();
-
- }
-
-
- roller_mount_sensor_pcb_support();
-
- if (draw_switches)
- for ( i = [0:len(sw)-1] ){
- rotate([0,0,sw[i][0][2]])
- translate(sw[i][1])
- rotate([90+sw[i][0][0],0,sw[i][0][1]])
- translate([0, 0, 1.])
- mx_switch($t);
- }
- if (draw_keycap)
- for ( i = [0:len(sw)-1] ){
- rotate([0,0,sw[i][0][2]])
- translate(sw[i][1])
- rotate([90+sw[i][0][0],0,sw[i][0][1]])
- translate([0, 0, 1.])
- mx_switch($t);
- }
- }
- }
-
- module trackball_bottom_wrap() {
-
- color("magenta")
- translate([0, 0, -3.0])
- difference() {
- cylinder(d = base_dia, h = bottom_base_below_zero + ball_h - 16);
-
- translate([0, 0, bottom_base_wall])
- cylinder(d = base_dia - bottom_base_wall * 2 - bottom_add_wall, h = bottom_base_below_zero + ball_h - 15);
-
- translate([-pico_co_w / 2, -pico_co_l / 2, 2.5])
- cube([pico_co_w, pico_co_l, bottom_base_below_zero + ball_h - 11]);
-
- translate([pico_w / 2 - reset_button_off_x, pico_l / 2 - reset_button_off_y, -1])
- cylinder(d = reset_button_dia, h = bottom_base_wall + 2);
- }
-
- color("cyan")
- for (r = screw_angles)
- rotate([0, 0, r])
- translate([screw_off, 0, -3])
- cylinder(d = screw_head_d + 4, h = bottom_base_below_zero + ball_h - 16 );
- }
-
- module usb_cutout() {
- translate([8,1,4.5])
- rotate([0,180,0]) {
- translate([-usb_cutout_w_add / 2, -2, -usb_cutout_h_add / 2])
- cube([pico_usb_w + usb_cutout_w_add, 5, pico_usb_h + usb_cutout_h_add]);
-
- hull() {
- translate([-usb_cutout_w_add / 2, 1, -usb_cutout_h_add / 2])
- cube([pico_usb_w + usb_cutout_w_add, $e, pico_usb_h + usb_cutout_h_add]);
-
- translate([-usb_cutout_grow_x / 2, 1+usb_cutout_grow_l, -usb_cutout_grow_y / 2])
- cube([pico_usb_w + usb_cutout_grow_x, $e, pico_usb_h + usb_cutout_grow_y]);
-
- translate([-usb_cutout_grow_x / 2, 1+usb_cutout_grow_l*10, -usb_cutout_grow_y / 2])
- cube([pico_usb_w + usb_cutout_grow_x, $e, pico_usb_h + usb_cutout_grow_y]);
- }
- }
- }
-
-
-
- module trackball_bottom() {
- difference() {
- trackball_bottom_wrap();
-
-
- translate([0, 0, ball_dia / 2 + ball_h])
- rotate([0, 180, 0])
- translate([-pico_w / 2, -pico_l / 2, 0])
- translate([(pico_w - pico_usb_w) / 2, pico_l - 1 + pico_usb_off, 30])
- usb_cutout();
-
- for (r = screw_angles)
- rotate([0, 0, r])
- translate([screw_off, 0, -$e-3]) {
- cylinder(d = screw_dia, h = bottom_base_below_zero + 30);
- cylinder(d = screw_head_d, h = screw_head_h + 1);
- }
- }
- }
-
- module assembly() {
- translate([0, 0, assembly_dist / 2])
- trackball_top();
-
- translate([0, 0, -assembly_dist / 2])
- trackball_bottom();
- }
-
- module print() {
- translate([-40, 0, -4])
- trackball_top();
-
- translate([40, 0, bottom_base_below_zero])
- trackball_bottom();
-
- for (y = [-20, 0, 20])
- translate([0, y, 8.5])
- roller_holder();
- }
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