add weight

.gitignore

@@ -1,5 +1,7 @@
 *.stl
 *.3mf
+*.dxf
+*.gcode
 
 # Created by https://www.toptal.com/developers/gitignore/api/linux,windows,macos,vim
 # Edit at https://www.toptal.com/developers/gitignore?templates=linux,windows,macos,vim

Makefile

@@ -1,4 +1,4 @@
-.PHONY: stl 3mf
+.PHONY: stl 3mf dxf
 
 stl:
 	openscad --export-format binstl -o upper_case.stl upper_case.scad
@@ -10,3 +10,7 @@ stl:
 	openscad --export-format 3mf -o lower_case.3mf lower_case.scad
 	openscad --export-format 3mf -o plate.3mf plate.scad
 
+dxf:
+	sed -i 's/\/\/ projection/projection/' plate.scad; openscad --export-format dxf -o plate.dxf plate.scad; sed -i 's/projection/\/\/ projection/' plate.scad
+	openscad --export-format dxf -o weight.dxf weight.scad
+

README.md

@@ -2,21 +2,30 @@
 ![plate](https://gitlab.com/noisy_cricket/cad/-/raw/main/plate.png?inline=false)
 ![lower case](https://gitlab.com/noisy_cricket/cad/-/raw/main/lower_case.png?inline=false)
 
-CAD files for noisy cricket
+# CAD files for noisy cricket
-===========================
 
 Create files for 3D printing or CNC by running this (needs openscad):
 
 ```shell
 make stl
 make 3mf
+make dxf
 ```
 
-You can also find the CAD files on [printables.com](https://www.printables.com/model/531838-noisy-cricket-mini-gaming-keyboard).
+_You only need the DXF files if you want to CNC the plate or weight._
 
-- Threaded inserts for the plate are M2, height 2mm, outer diameter 3.2
+## Hardware:
-- Screws for the plate mounting are M2, length 3-3.5mm
+
-- Screws for the PCB mounting are M2, length 3.5-4.6mm
+- Threaded inserts for the plate, USB C daughter board and standoffs are M2, height 2mm, outer diameter 3.2 (10x)
+- Screws for the plate and USB-C daughter board are M2, length 3-3.5mm (6x)
+- Screws for the PCB mounting are M2, length 3.5-4.6mm (4x)
+- Standoffs are M2, length 3mm (4x)
+
+Threaded inserts from [AliExpress](https://www.aliexpress.com/item/1005004873154281.html).
+Screws from [AliExpress](https://www.aliexpress.com/item/32810852732.html).
+Standoffs from [AliExpress](https://www.aliexpress.com/item/1005003328519584.html).
+
+You can also find the CAD files on [printables.com](https://www.printables.com/model/531838-noisy-cricket-mini-gaming-keyboard).
 
 ---
 

lower_case.scad

@@ -40,14 +40,15 @@ color("SaddleBrown") difference() {
     }
     cube([pololu_width, pololu_depth, pcb_thickness+0.1], center=true);
     // screw holes
-    translate([-pololu_width/2+pololu_hole_spacing, pololu_depth/2-pololu_hole_spacing, -pcb_thickness/2-2]) cylinder(h=2, r=pololu_holes_radius);
+    translate([-pololu_width/2+pololu_hole_spacing, pololu_depth/2-pololu_hole_spacing, -pcb_thickness/2-threaded_insert_height]) cylinder(h=threaded_insert_height, d=3);
-    translate([pololu_width/2-pololu_hole_spacing, pololu_depth/2-pololu_hole_spacing, -pcb_thickness/2-2]) cylinder(h=2, r=pololu_holes_radius);
+    translate([pololu_width/2-pololu_hole_spacing, pololu_depth/2-pololu_hole_spacing, -pcb_thickness/2-threaded_insert_height]) cylinder(h=threaded_insert_height, d=3);
   }
   
   // TODO: make dependent on case size
-  translate([65, 26.75, case_bottom_thickness/2]) {
+  translate([65, 26, case_bottom_thickness/2]) {
-    cube([10, 40, case_bottom_thickness/2+1]);
+    translate([-7.5,30,0]) linear_extrude(case_bottom_thickness/2+1) polygon([[7.5,0], [7.5,10.75], [0,10.75]]);
-    cube([72, 10, case_bottom_thickness/2+1]);
+    cube([10, 40.75, case_bottom_thickness/2+1]);
+    cube([72, 11, case_bottom_thickness/2+1]);
   }
   
   // screw holes for upper case
@@ -61,25 +62,21 @@ color("SaddleBrown") difference() {
   translate([-case_thickness, pcb_depth-2*pcb_radius+case_thickness, 0]) cylinder(h=case_thickness+standoff_height+pcb_thickness+5, d=2);
   translate([pcb_width-2*pcb_radius+case_thickness, pcb_depth-2*pcb_radius+case_thickness, 0]) cylinder(h=case_thickness+standoff_height+pcb_thickness+5, d=2);
 
-  // hole for weight
+  // mounting standoffs
-  difference() {
+  for(i = [0 : len(mounting_holes)-1]) {
-    hull() {
+    translate([mounting_holes[i][0] - pcb_radius, mounting_holes[i][1] - pcb_radius, case_bottom_thickness - 3]) union() {
-      translate([5,5,0]) cylinder(h=2, d=10);
+      translate([0,0,1]) cylinder(h=2, d=3);
-      translate([pcb_width-2*pcb_radius-5,5,0]) cylinder(h=2, d=10);
+      cylinder(h=3, d=2);
-      translate([5,pcb_depth-2*pcb_radius-5,0]) cylinder(h=2, d=10);
-      translate([pcb_width-2*pcb_radius-5,pcb_depth-2*pcb_radius-5,0]) cylinder(h=2, d=10);
     }
-    translate([pcb_width/2,pcb_depth/2+1,1.8]) mirror([1,0,0]) linear_extrude(0.2) text(text="noisy cricket", size=10, font="Liberation Sans:style=Bold", halign="center");
-    translate([pcb_width/2,pcb_depth/2-11,1.8]) mirror([1,0,0]) linear_extrude(0.2) text(text="© XenGi 2023", size=6, font="Liberation Sans:style=Bold", halign="center");
   }
-}
 
-
+  // hole for weight
-// mounting standoffs
+  hull() {
-color("SaddleBrown") for(i = [0 : len(mounting_holes)-1]) {
+    translate([5,5,0]) cylinder(h=1.5, d=10);
-  translate([mounting_holes[i][0] - pcb_radius, mounting_holes[i][1] - pcb_radius, case_bottom_thickness]) difference() {
+    translate([pcb_width-2*pcb_radius-5,5,0]) cylinder(h=1.5, d=10);
-    cylinder(h=standoff_height, d=4);
+    translate([5,pcb_depth-2*pcb_radius-5,0]) cylinder(h=1.5, d=10);
-    cylinder(h=standoff_height, d=2);
+    translate([pcb_width-2*pcb_radius-5,pcb_depth-2*pcb_radius-5,0]) cylinder(h=1.5, d=10);
   }
+  translate([pcb_width/2,pcb_depth/2+1,1.5]) mirror([1,0,0]) linear_extrude(0.2) text(text="noisy cricket", size=10, font="Liberation Sans:style=Bold", halign="center");
+  translate([pcb_width/2,pcb_depth/2-11,1.5]) mirror([1,0,0]) linear_extrude(0.2) text(text="© XenGi 2023", size=6, font="Liberation Sans:style=Bold", halign="center");
 }
-

weight.scad

@@ -0,0 +1,12 @@
+// This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
+
+include <util.scad>
+
+$fn = 64;
+
+projection(cut=true) hull() {
+  translate([5,5,0]) cylinder(h=1.5, d=10);
+  translate([pcb_width-2*pcb_radius-5,5,0]) cylinder(h=1.5, d=10);
+  translate([5,pcb_depth-2*pcb_radius-5,0]) cylinder(h=1.5, d=10);
+  translate([pcb_width-2*pcb_radius-5,pcb_depth-2*pcb_radius-5,0]) cylinder(h=1.5, d=10);
+}