add case design by kauzerei, with some tweaks. scad render github actions workflow.

.github/workflows/cmake.yml

 # https://github.com/raspberrypi/pico-examples/blob/master/.github/workflows/cmake.yml
 
 name: Firmware
+
+# build for each push and pull request
 on: [push, pull_request]
 
 env:
     runs-on: ubuntu-latest
 
     steps:
-    - name: Install dependencies
-      run: sudo apt-get install -y cxxtest build-essential gcc-arm-none-eabi mtools
-
-    - name: Checkout repo
-      uses: actions/checkout@v3
-      with:
-        path: repo
-
-    - name: Checkout repo submodules
-      working-directory: ${{github.workspace}}/repo
-      run: git submodule update --init
-
-    - name: Checkout pico-sdk submodules
-      working-directory: ${{github.workspace}}/repo/pico-sdk
-      run: git submodule update --init
-
-    - name: Create Build Environment
-      working-directory: ${{github.workspace}}/repo
-      run:  cmake -E make_directory ${{github.workspace}}/repo/build
-
-    - name: Configure CMake
-      shell: bash
-      working-directory: ${{github.workspace}}/repo/build
-      run: cmake .. -DPICO_BOARD=pico_w -DCMAKE_BUILD_TYPE=$BUILD_TYPE
-
-    - name: Get core count
-      id: core_count
-      run : cat /proc/cpuinfo  | grep processor | wc -l
-
-    - name: Build
-      working-directory: ${{github.workspace}}/repo/build
-      shell: bash
-      # Execute the build.  You can specify a specific target with "--target <NAME>"
-      run: cmake --build . --config $BUILD_TYPE --parallel $(nproc)
-
-    - name: Upload a Build Artifact
-      uses: actions/upload-artifact@v4.0.0
-      with:
-        name: firmware.uf2
-        path: ${{github.workspace}}/repo/build/picowota_gadget.uf2
-        if-no-files-found: error
-
-    - name: Upload a Build Artifact
-      uses: actions/upload-artifact@v4.0.0
-      with:
-        name: update.elf
-        path: ${{github.workspace}}/repo/build/gadget.elf
-        if-no-files-found: error
+      - name: Install dependencies
+        run: sudo apt-get install -y cxxtest build-essential gcc-arm-none-eabi mtools zip
+
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          path: repo
+          fetch-depth: 0
+
+      - name: Checkout repo submodules
+        working-directory: ${{github.workspace}}/repo
+        run: git submodule update --init
+
+      - name: Checkout pico-sdk submodules
+        working-directory: ${{github.workspace}}/repo/pico-sdk
+        run: git submodule update --init
+
+      - name: Create Build Environment
+        working-directory: ${{github.workspace}}/repo
+        run:  cmake -E make_directory ${{github.workspace}}/repo/build
+
+      - name: Configure CMake
+        shell: bash
+        working-directory: ${{github.workspace}}/repo/build
+        run: cmake .. -DPICO_BOARD=pico_w -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+      - name: Get core count
+        id: core_count
+        run : cat /proc/cpuinfo  | grep processor | wc -l
+
+      - name: Build
+        working-directory: ${{github.workspace}}/repo/build
+        shell: bash
+        run: cmake --build . --config $BUILD_TYPE --parallel $(nproc)
+
+      - name: Upload a Build Artifact
+        uses: actions/upload-artifact@v4.0.0
+        with:
+          name: firmware.uf2
+          path: ${{github.workspace}}/repo/build/picowota_gadget.uf2
+          if-no-files-found: error
+
+      - name: Upload a Build Artifact
+        uses: actions/upload-artifact@v4.0.0
+        with:
+          name: update.elf
+          path: ${{github.workspace}}/repo/build/gadget.elf
+          if-no-files-found: error
+
+      - name: Archive release files
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          cd ${{github.workspace}}/repo/build
+          zip -r picowota_gadget.uf2 gadget.elf firmware
+
+      - name: Upload release files
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v1
+        with:
+          files: ${{github.workspace}}/repo/build/firmware.zip

.github/workflows/scad.yml

+name: STLs
+
+# build for each push and pull request
+on: [push, pull_request]
+
+jobs:
+  render:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Checkout repo submodules
+        run: git submodule update --init
+
+      - name: Install dependencies
+        run: sudo apt-get install -y openscad zip
+
+      - name: Render STLs
+        run: |
+          ./case/generate_stls.sh
+
+      - name: Upload part files
+        uses: actions/upload-artifact@v4.0.0
+        with:
+          name: volcano-remote-stl
+          path: case/stl
+          if-no-files-found: error
+
+      - name: Archive release files
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          cd case
+          zip -r volcano-remote-stl stl
+
+      - name: Upload release files
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v1
+        with:
+          files: case/volcano-remote-stl.zip

.gitignore

 *.sl1
 *.wow
 .directory
+case/stl

README.md

 The case design is also licensed as GPLv3.
 It uses a [Pi Pico case model](https://www.printables.com/model/210898-raspberry-pi-pico-case) licensed as CC-BY-NC-SA.
 But this is only used for visualization purposes and doesn't influence the 3D model at all.
+The case design itself has initially been made by [Kauzerei](https://github.com/kauzerei/OpensCadaver/blob/main/models/pico_stuff.scad).
 
     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

case/case.scad

+/*
+ * case.scad
+ *
+ * https://github.com/kauzerei/OpensCadaver/blob/main/models/pico_stuff.scad
+ *
+ * Copyright (c) 2023 Kauzerei (openautolab@kauzerei.de)
+ * Copyright (c) 2023 Thomas Buck (thomas@xythobuz.de)
+ *
+ * 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.waveshare.com/wiki/Pico-LCD-1.3
 lcd_w = 52.0;
 lcd_h = 26.5;
 p_w = 21;
 p_h = 51;
 p_t = 1.0;
+p_usb_h = 2.8;
 
-pico_header_h = 2.0; // todo
+pico_header_h = 2.5; // todo
 lcd_header_h = 10.0; // todo
 
 header_h = pico_header_h + lcd_header_h;
 
+part="OPT_assembly"; //[bottom,top,button,print,OPT_assembly]
+wall=1.5;
+extra=4; //lip on the lid that presses top pcb down
+thread=3;
+air=0.5;
+bissl=1/100;
+button=4;
+joystick=6;
+height=16.8+air+extra;
+width=52.4+1.5+2*air;
+length=26.7+2*air;
+$fa=1/1;
+$fs=1/2;
+
+total_width = width+2*wall;
+total_len = length+4*wall+2*thread;
+
 module lcd() {
     color("blue")
     translate([-lcd_h / 2, -lcd_w / 2, 0])
 module hw() {
     translate([0, 0, header_h])
     lcd();
-    
+
     translate([p_w / 2, -p_h / 2, 0])
     rotate([0, 180, 0])
     pico();
 }
 
-hw();
+module bottom() {
+  difference() {
+    cube([total_width, total_len, height + wall]);
+    translate([wall,2*wall+thread,wall])cube([width,length,height+bissl]);
+    for (tr=[[wall+thread/2,wall+thread/2,height/2+wall],
+             [wall+thread/2,length+3*wall+1.5*thread,height/2+wall],
+             [width+wall-thread/2,wall+thread/2,height/2+wall],
+             [width+wall-thread/2,length+3*wall+1.5*thread,height/2+wall]])
+      translate(tr) cylinder(h=height/2+bissl,d=thread);
+    translate([wall/2,2*wall+thread+length/2,3-bissl])cube([wall+bissl,8,6],center=true);
+    translate([0,2*wall+thread+length/2,wall+7])rotate([0,90,0])cylinder(d=button,h=2*wall+bissl,center=true);
+  }
+}
+
+module top() {
+  difference() {
+    cube([total_width, total_len, wall]);
+    for (tr=[[wall+thread/2,wall+thread/2,-bissl],
+             [wall+thread/2,length+3*wall+1.5*thread,-bissl],
+             [width+wall-thread/2,wall+thread/2,-bissl],
+             [width+wall-thread/2,length+3*wall+1.5*thread,-bissl]])
+      translate(tr) cylinder(h=wall+2*bissl,d=thread);
+    translate([wall+1.5,2*wall+thread,-bissl])
+      for (tr=[[47.7+air,5.5+0],
+               [47.7+air,5.5+5.7],
+               [47.7+air,5.5+2*5.7],
+               [47.7+air,5.5+3*5.7],
+               [6.7+0.5,13.8+air]])
+        translate(tr) cylinder(h=wall+2*bissl,d=button);
+    translate([wall+1.5+6.7+air,2*wall+thread+13.8+air,-bissl]) cylinder(h=wall+2*bissl,d=joystick);
+    translate([wall+13.5+1.5,2*wall+thread,-bissl])cube([31,27,wall+2*bissl]);
+  }
+  translate([wall+13.5+1.5-2,2*wall+thread,-extra])cube([2,27,extra]);
+  translate([wall+13.5+1.5+31,2*wall+thread,-extra])cube([2,27,extra]);
+}
+
+module button() {
+  cylinder(h=1,d=5);
+  cylinder(h=5,d=3);
+}
+
+module bottom_assm() {
+    %translate([0, 0, wall + p_t + p_usb_h])
+    rotate([0, 0, 90])
+    hw();
+
+    translate([-total_width / 2, -total_len / 2, 0])
+    bottom();
+}
+
+if (part == "bottom") {
+    bottom_assm();
+} else if (part == "top") {
+    rotate([180, 0, 0])
+    top();
+} else if (part == "button") {
+    button();
+} else if (part == "print"){
+    translate([0, 10, 0])
+    bottom();
+
+    translate([0, -10, wall])
+    rotate([180, 0, 0])
+    top();
+
+    for (i = [1 : 4])
+    translate([-10, -25 + i * 10, 0])
+    button();
+} else {
+    difference() {
+        union() {
+            bottom_assm();
+
+            translate([-total_width / 2, -total_len / 2, height + wall])
+            top();
+        }
+
+        translate([-total_width / 2 - 1, 0, -2])
+        cube([total_width + 2, total_len / 2 + 2, height + wall + 4]);
+    }
+}

case/generate_stls.sh

+#!/bin/bash
+
+# ----------------------------------------------------------------------------
+# Copyright (c) 2023 Kauzerei (openautolab@kauzerei.de)
+# Copyright (c) 2023 Thomas Buck (thomas@xythobuz.de)
+#
+# 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/>.
+# ----------------------------------------------------------------------------
+
+# space separated list of scad files (without extension)
+MODULES="case"
+OUTDIR="stl"
+
+# enter directory of script (case)
+cd "$(dirname "$0")"
+
+# Detect OS
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    echo "Mac OS X detected"
+    SCAD="open -n -a OpenSCAD --args"
+else
+    echo "Linux detected"
+    SCAD="openscad"
+fi
+
+echo "deleting previous build output"
+rm -rf $OUTDIR
+mkdir -p $OUTDIR
+
+for MODULE in $MODULES
+do
+    PARTS=$(grep -o "part.*//.*\[.*]" ${MODULE}.scad | sed 's/,/ /g' | sed 's/.*\[\([^]]*\)\].*/\1/g')
+    echo "generating from ${MODULE}"
+
+    for PART in ${PARTS}
+    do
+        if [[ "${PART}" != "OPT_"* ]]; then
+            echo ${PART}
+            FILENAME=$(echo $OUTDIR/${MODULE}_${PART}.stl | tr '[:upper:]' '[:lower:]')
+            $SCAD $(pwd)/${MODULE}.scad --D part=\"${PART}\" --o $(pwd)/${FILENAME}
+        fi
+    done
+done