1 /* All distances are in mm. */
3 /* set output quality */
6 /* Distance between key centers. */
8 row_spacing = column_spacing;
10 /* This number should exceed row_spacing and column_spacing. The
11 default gives a 1mm = (20mm - 19mm) gap between keycaps and cuts in
15 /* rotation angle; the angle between the halves is twice this
19 /* The radius of screw holes. Holes will be slightly bigger due
21 screw_hole_radius = 1.5;
22 /* Each screw hole is a hole in a "washer". How big these "washers"
23 should be depends on the material used: this parameter and the
24 `switch_hole_size` determine the spacer wall thickness. */
25 washer_radius = 4 * screw_hole_radius;
27 /* This constant allows tweaking the location of the screw holes near
28 the USB cable. Only useful with small `angle` values. Try the value
29 of 10 with angle=0. */
30 back_screw_hole_offset = 0;
32 /* Distance between halves. */
35 /* The approximate size of switch holes. Used to determine how
36 thick walls can be, i.e. how much room around each switch hole to
37 leave. See spacer(). */
38 switch_hole_size = 14;
40 /* Sets whether the case should use notched holes. As far as I can
41 tell these notches are not all that useful... */
42 use_notched_holes = true;
44 /* Number of rows and columns in the matrix. You need to update
45 staggering_offsets if you change n_cols. */
49 /* Number of thumb keys (per hand), try 1 or 2. */
52 /* The width of the USB cable hole in the spacer. */
53 cable_hole_width = 12;
55 /* Vertical column staggering offsets. The first element should
57 staggering_offsets = [0, 5, 11, 6, 3];
59 /* Whether or not to split the spacer into quarters. */
60 quarter_spacer = false;
62 /* Where the top/bottom split of a quartered spacer will be. */
63 spacer_quartering_offset = 60;
65 module rz(angle, center=undef) {
66 /* Rotate children `angle` degrees around `center`. */
70 for (i=[0:$children-1])
77 /* Compute coordinates of a point obtained by rotating p angle degrees
78 around center. Used to compute locations of screw holes near the
80 function rz_fun(p, angle, center) = [cos(angle) * (p[0] - center[0]) - sin(angle) * (p[1] - center[1]) + center[0],
81 sin(angle) * (p[0] - center[0]) + cos(angle) * (p[1] - center[1])+ center[1]];
83 module switch_hole(position, notches=use_notched_holes) {
84 /* Cherry MX switch hole with the center at `position`. Sizes come
85 from the ErgoDox design. */
88 notch_offset = 4.2545;
92 square([hole_size, hole_size], center=true);
93 if (notches == true) {
94 translate([0, notch_offset]) {
95 square([hole_size+2*notch_depth, notch_width], center=true);
97 translate([0, -notch_offset]) {
98 square([hole_size+2*notch_depth, notch_width], center=true);
105 module regular_key(position, size) {
106 /* Create a hole for a regular key. */
107 translate(position) {
108 square([size, size], center=true);
112 module thumb_key(position, size) {
113 /* Create a hole for a 1x1.5 unit thumb key. */
114 translate(position) {
116 translate(-position) {
117 regular_key(position, size);
123 module column (bottom_position, switch_holes, key_size=key_hole_size) {
124 /* Create a column of keys. */
125 translate(bottom_position) {
126 for (i = [0:(n_rows-1)]) {
127 if (switch_holes == true) {
128 switch_hole([0, i*column_spacing]);
130 regular_key([0, i*column_spacing], key_size);
136 module rotate_half() {
137 /* Rotate the right half of the keys around the top left corner of
138 the thumb key. Assumes that the thumb key is a 1x1.5 key and that
139 it is shifted 0.5*column_spacing up relative to the nearest column. */
140 rotation_y_offset = 1.75 * column_spacing;
141 for (i=[0:$children-1]) {
142 rz(angle, [hand_separation, rotation_y_offset]) {
148 module add_hand_separation() {
149 /* Shift everything right to get desired hand separation. */
150 for (i=[0:$children-1]) {
151 translate([0.5*hand_separation, /* we get back the full separation
152 because of mirroring */
157 module right_half (switch_holes=true, key_size=key_hole_size) {
158 /* Create switch holes or key holes for the right half of the
159 keyboard. Different key_sizes are used in top_plate() and
161 x_offset = 0.5 * row_spacing;
162 y_offset = 0.5 * column_spacing;
163 thumb_key_offset = y_offset + 0.5 * column_spacing;
165 add_hand_separation() {
166 for (j=[0:(n_thumb_keys-1)]) {
167 if (switch_holes == true) {
168 switch_hole([x_offset + j*row_spacing, thumb_key_offset]);
170 thumb_key([x_offset + j*row_spacing, thumb_key_offset], key_size);
173 for (j=[0:(n_cols-1)]) {
174 column([x_offset + (j+n_thumb_keys)*row_spacing, y_offset + staggering_offsets[j]], switch_holes, key_size);
180 module screw_hole(radius, offset_radius, position, direction) {
181 /* Create a screw hole of radius `radius` at a location
182 `offset_radius` from `position`, (diagonally), in the direction
183 `direction`. Oh, what a mess this is. */
184 /* direction is the 2-element vector specifying to which side of
185 position to move to, [-1, -1] for bottom left, etc. */
187 /* radius_offset is the offset in the x (or y) direction so that
188 we're offset_radius from position */
189 radius_offset = offset_radius / sqrt(2);
190 /* key_hole_offset if the difference between key spacing and key
192 key_hole_offset = 0.5*(row_spacing - key_hole_size);
193 x = position[0] + (radius_offset - key_hole_offset) * direction[0];
194 y = position[1] + (radius_offset - key_hole_offset) * direction[1];
200 module right_screw_holes(hole_radius) {
201 /* coordinates of the back right screw hole before rotation... */
202 back_right = [(n_cols+n_thumb_keys)*row_spacing,
203 staggering_offsets[n_cols-1] + n_rows * column_spacing];
205 tmp = rz_fun(back_right, angle, [0, 2.25*column_spacing]);
210 add_hand_separation() {
211 screw_hole(hole_radius, washer_radius,
214 screw_hole(hole_radius, washer_radius,
215 [(n_cols+n_thumb_keys)*row_spacing, staggering_offsets[n_cols-1]],
217 screw_hole(hole_radius, washer_radius,
223 /* add the screw hole near the cable hole */
224 translate([washer_radius - tmp[0] - 0.5*hand_separation,
225 back_screw_hole_offset]) {
227 add_hand_separation() {
228 screw_hole(hole_radius,
237 module screw_holes(hole_radius) {
238 /* Create all the screw holes. */
239 right_screw_holes(hole_radius);
240 mirror ([1,0,0]) { right_screw_holes(hole_radius); }
243 module left_half(switch_holes=true, key_size=key_hole_size) {
244 mirror ([1,0,0]) { right_half(switch_holes, key_size); }
247 module bottom_plate() {
248 /* bottom layer of the case */
250 hull() { screw_holes(washer_radius); }
251 screw_holes(screw_hole_radius);
256 /* top layer of the case */
264 module switch_plate() {
265 /* the switch plate */
274 /* Create a spacer. */
280 right_half(switch_holes=false, key_size=switch_hole_size + 3);
281 left_half(switch_holes=false, key_size=switch_hole_size + 3);
283 /* add the USB cable hole: */
284 translate([-0.5*cable_hole_width, 2*column_spacing]) {
285 square([cable_hole_width, (2*n_rows) * column_spacing]);
288 screw_holes(washer_radius);
290 screw_holes(screw_hole_radius);
294 module spacer_quadrant(spacer_quadrant_number) {
295 /* Cut a quarter of a spacer. */
296 translate([0, spacer_quartering_offset]) {
298 translate([0, -spacer_quartering_offset]) { spacer(); }
299 rotate([0, 0, spacer_quadrant_number * 90]) { square([1000, 1000]); }
304 module quartered_spacer()
306 /* Assemble all four quarters of a spacer. */
309 translate([-5,-10]) spacer_quadrant(2);
310 translate([5,-10]) spacer_quadrant(3);
313 /* Create all four layers. */
315 translate([300, 0]) { switch_plate(); }
316 translate([0, 150]) { bottom_plate(); }
317 translate([300, 150]) {
318 if (quarter_spacer == true) {