Put all adapters in a single project. Render the three existing adapters

.gitmodules

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+[submodule "scad/common"]
+	path = scad/common
+	url = https://git.sixteenmillimeter.com/modules/common.git

LICENSE

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+Copyright (c) 2025 M McWilliams
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Film Adapters
+
+This module contains various adapters for film reels and cores to allow for interoperability between tools designed for differnt formats.
+
+Whats included:
+
+* [16mm Core Adapter](#16mm_core)
+* [Super8 to 16mm Core Adapter](#super8_16mm_core)
+* [16mm to Super8 Reel Adapter](#16mm_super8_reel)
+
+-----
+
+<a name="16mm_core"></a>
+
+## 16mm Core Adapter
+
+This adapts the square spindles typically used for 16mm daylight spools to hold a 16mm film core.
+It can be used in cameras, rewinds and other gear that will hold a daylight spool.
+
+![16mm Core Adapter](./img/adapter_16mm_core.jpg)
+
+![Download STL](./stl/adapter_16mm_core.stl)
+
+<a name="super8_16mm_core"></a>
+
+## Super8 to 16mm Core Adapter
+
+![Super8 to 16mm Core Adapter](./img/adapter_super8_16mm_core.jpg)
+
+![Download STL](./stl/adapter_super8_16mm_core.stl)
+
+<a name="16mm_super8_reel"></a>
+
+## 16mm to Super8 Reel Adapter
+
+This adapts the square spindles 
+
+![16mm to Super8 Reel Adapter](./img/adapter_16mm_super8_reel.jpg)
+
+![Download STL](./stl/aadapter_16mm_super8_reel.stl)

layout.js

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+function rotatePoint(centerX, centerY, distance, angleInDegrees) {
+    const angleInRadians = angleInDegrees * (Math.PI / 180);
+    
+    const x = centerX + (distance * Math.cos(angleInRadians));
+    const y = centerY + (distance * Math.sin(angleInRadians));
+    
+    return { x, y, z : 0 };
+}
+let plastic = [
+  'gray_plastic2',
+  'yellow_plastic',
+  'neonblue_plastic'
+]
+let obj = [
+  'adapter_16mm_core',
+  'adapter_16mm_to_super8_reel',
+  'adapter_super8_to_16mm_core'
+];
+let meta = {
+  objects : []
+}
+let starting = 33/2; //(360 / (obj.length * 2));
+for (let i = 0; i < obj.length; i++) {
+  meta.objects.push ({
+      name : obj[i], 
+      material : plastic[i],
+      position : rotatePoint(0, 0, 40, starting + (i * (360 / obj.length))),
+      rotation : {
+        x : 0,
+        y : 90,
+        z : starting + (i * (360 / obj.length))
+      }
+  });
+}
+
+console.log(JSON.stringify(meta, null, '\t'))

meta.json

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+{
+	"camera" : {
+		"x" : 60,
+		"y" : -60,
+		"z" : 0,
+		"focus_x" : 30,
+		"focus_y" : -30
+	},
+	"objects": [
+		{
+			"name": "adapter_16mm_core",
+			"material": "gray_plastic2",
+			"position": {
+				"x": 38.35278939472772,
+				"y": 11.360613788156906,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 16.5
+			}
+		},
+		{
+			"name": "adapter_16mm_to_super8_reel",
+			"material": "yellow_plastic",
+			"position": {
+				"x": -29.014974840491504,
+				"y": 27.534183027750156,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 136.5
+			}
+		},
+		{
+			"name": "adapter_super8_to_16mm_core",
+			"material": "neonblue_plastic",
+			"position": {
+				"x": -9.337814554236205,
+				"y": -38.894796815907064,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 256.5
+			}
+		}
+	],
+	"src" : [
+		"README.md",
+		"LICENSE",
+		"scad.sh",
+		"scad/film_adapter.scad",
+		"scad/common/common.scad",
+		"scad/common/c14n_stl.py",
+		"scad/common/scad.sh"
+	]
+}

scad.sh

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+#!/bin/bash
+
+bash scad/common/scad.sh scad/adapter.scad "${@}"

scad/adapter.scad

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+use <./common/common.scad>;
+
+$fn = 80;
+
+module square_spindle_reference () {
+    SQUARE = 7.95;
+    translate([0, 0, 12.3 - 1]) {
+        difference() {
+            union() {
+                translate([0, 0, -(12.3 / 2)]) cube([SQUARE, SQUARE, 12.3], center = true);
+                rotate([0, 90, 0]) cylinder(r = SQUARE / 2, h =8, center = true);
+                rotate([0, 90, 90]) cylinder(r = SQUARE / 2, h =8, center = true);
+            }
+            for (i = [0 : 4]) {
+                rotate([0, 0, i * 90]) translate([0, 4.9, 1]) rotate([12, 0, 0]) cube([SQUARE, 2, 10], center = true);
+            }
+        }
+        
+    }
+    translate([0, 0, (39 / 2)]) cylinder(r = 6.57 / 2, h = 39, center = true, $fn = 60);    
+}
+
+
+module square_spindle_reference_alternate () {
+	$fn = 60;
+	difference(){
+		translate([0, 0, -1.5]) cube([7.5, 7.5, 21.5], center = true);
+		for (i = [0:4]) {
+			rotate([0, 0, (i * 90)]){
+				translate([(7.5 / 2) + .4, (7.5 / 2) + .4, 18.5 / 2]) rotate([0, -15, 45]) cube([2.5, 7.5, 7.5], center = true);
+			}
+		}		
+	}
+	difference () {
+		union() {
+			translate([0, 0, (18.5 / 2) + (3.5 / 2)]) cylinder(r = R(7.5), h = 3.5, center = true);
+			translate([0, 0, (18.5 / 2) + (7.5 / 2)]) sphere(r =(7.5));
+		}
+		translate ([0, 0, (18.5 / 2) + 7.5]) cube([10, 10, 2], center = true);
+	}
+
+	translate([0, 0, -(18.5/ 2) - (3 / 2) - 3]) cylinder(r = R(16), h = 3, center = true);
+}
+
+module super8_void (Height = 50) {
+	fin_w = 2;
+	center_d = 13.5;
+	fin_l = (center_d / 2) + 4;
+	for (i = [0:2]) {
+		rotate([0, 0, (i * (360/3))]){
+			translate([0, fin_l/2, 0]) cube([fin_w, fin_l, Height], center = true);
+		}
+	}
+	cylinder(r = R(center_d), h = Height, center = true);
+}
+
+module 16mm_square_spindle_void (Height = 21.5) {
+	cube([8.3, 8.3, Height], center = true);
+}
+
+module 16mm_core_adapter_body () {
+    $fn = 100;
+	difference () {
+		union () {
+			cylinder(r1 = 13.2, r2 = 12.8, h = 16.6, center = true);
+			translate([0, 0, -8.8]) cylinder(r = 15, h = 1, center = true);
+			translate([14.5, 0, -.5]) cube([3.6, 3.6, 17.6], center = true);
+		}
+		children();
+	}
+}
+
+module 16mm_core_adapter () {
+	16mm_core_adapter_body() 16mm_square_spindle_void();
+}
+
+module super8_to_16mm_core_adapter () {
+	16mm_core_adapter_body() super8_void();
+}
+
+module 16mm_to_super8_reel_adapter () {
+    BOTTOM_D = 21.53;
+    BOTTOM_H = 1.5;
+    D = 12.72;
+    H = 10;
+    SQUARE = 8.2;
+    TAPER = 1.4;
+    PEG_H = 9;
+    PEG_L = 3.18;
+    PEG_W = 2;
+    
+    $fn = 200;
+    
+    difference () {
+        union () {
+            cylinder(r = R(BOTTOM_D), h = BOTTOM_H, center = true);
+            translate([0, 0, (BOTTOM_H / 2) + H / 2]) cylinder(r = R(D), h = H, center = true);
+            translate([0, 0, (BOTTOM_H / 2) + H + (TAPER / 2)]) cylinder(r1 = R(D), r2 = R(D) - TAPER, h = TAPER, center = true);
+        }
+        rotate([0, 0, 45]) cube([SQUARE, SQUARE, 60], center = true);
+        translate([0, 10, 0]) cube([3, 20, 60], center = true);
+    }
+    for (i = [1 : 2]) {
+        rotate([0, 0, i * 120]) translate([0, (D / 2) + (PEG_L / 2) - (PEG_W / 2), (BOTTOM_H / 2) + (PEG_H / 2)]) cube([PEG_W, PEG_L, PEG_H], center = true);
+        rotate([0, 0, i * 120]) translate([0, (D / 2) + (PEG_L / 2) + (PEG_W / 3), (BOTTOM_H / 2) + (PEG_H / 2)]) cylinder(r = R(PEG_W), h = PEG_H, center = true, $fn = 40);
+    }
+}
+
+PART = "16mm_core";
+
+if (PART == "16mm_core") {
+	16mm_core_adapter();
+} else if (PART == "super8_to_16mm_core") {
+	super8_to_16mm_core_adapter();
+} else if (PART == "16mm_to_super8_reel") {
+	16mm_to_super8_reel_adapter();
+} else {
+	//square_spindle_reference_alternate();
+}

scad/common

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+Subproject commit e2eeb27f173d739a174c0d147bcb62a16859e2d9