All cores projects merged into a single script. Layout of all cores fore rendering, will need changes.

.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 Cores
+
+![Film Core for 16mm with 2 inch diameter](./img/film_core_16mm_2in.stl)
+
+Film cores are used wind film for storage, handling, editing or projection.
+This project contains a script for generating cores of abitrary diameter, and the standards of 2 inch cores for camera usage and 3 inch cores for projection are included as printable STL files.
+
+This script will generate cores for 16mm, 8mm or 35mm gauge films.
+These can be used with the [split_reel](../split_reel) module.
+
+8mm cores are not common or standard but these seem to work for storage, editing and projection.
+
+This script will generate film cores with or without a center partition making them possible to print with no overhangs.
+Keep in mind cores *without* that center partition this makes for a weaker part and may buckle under the tension of longer films depending on how it is printed.
+
+Download the source and create an OpenSCAD file in the directory to generate arbitrary size cores as follows.
+
+```scad
+use <scad/film_core.scad>;
+
+film_core(16, 4 * 25.4, true);
+```
+
+This will generate a 4 inch core for 16mm gauge film with a center partition.
+
+```scad
+use <scad/film_core.scad>;
+
+film_core(8, 2.5 * 25.4, true);
+```
+
+This will generate a 2.5 inch core for 8mm gauge film without a center partition.
+
+The script can even be used to generate cores for more uncommon gauges, such as Pathé 9.5mm.
+
+```scad
+use <scad/film_core.scad>;
+
+film_core(9.5, 3 * 25.4, true);
+```
+
+# 35mm Cores
+
+-----
+
+## 35mm Cores
+
+-----
+

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 obj = [
+  "16mm_2in",
+  "16mm_2in_np",
+  "16mm_3in",
+  "16mm_3in_np",
+
+  "8mm_2in",
+  "8mm_2in_np",
+  "8mm_3in",
+  "8mm_3in_np",
+
+  "35mm_2in",
+  "35mm_2in_np",
+  "35mm_3in",
+  "35mm_3in_np"
+];
+let meta = {
+  objects : []
+}
+for (let i = 0; i < 12; i++) {
+  meta.objects.push ({
+      name : obj[i], 
+      material : "white_plastic",
+      position : rotatePoint(0, 0, 160, i * (360 / 12)),
+      rotation : {
+        x : 0,
+        y : 90,
+        z : i * (360 / 12)
+      }
+  });
+}
+
+console.log(JSON.stringify(meta, null, '\t'))

meta.json

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+{
+	"camera" : {
+		"x" : 0,
+		"y" : 0,
+		"z" : 0
+	},
+	"objects": [
+		{
+			"name": "16mm_2in",
+			"material": "white_plastic",
+			"position": {
+				"x": 160,
+				"y": 0,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 0
+			}
+		},
+		{
+			"name": "16mm_2in_np",
+			"material": "white_plastic",
+			"position": {
+				"x": 138.5640646055102,
+				"y": 79.99999999999999,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 30
+			}
+		},
+		{
+			"name": "16mm_3in",
+			"material": "white_plastic",
+			"position": {
+				"x": 80.00000000000001,
+				"y": 138.56406460551017,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 60
+			}
+		},
+		{
+			"name": "16mm_3in_np",
+			"material": "white_plastic",
+			"position": {
+				"x": 9.797174393178826e-15,
+				"y": 160,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 90
+			}
+		},
+		{
+			"name": "8mm_2in",
+			"material": "white_plastic",
+			"position": {
+				"x": -79.99999999999997,
+				"y": 138.5640646055102,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 120
+			}
+		},
+		{
+			"name": "8mm_2in_np",
+			"material": "white_plastic",
+			"position": {
+				"x": -138.5640646055102,
+				"y": 79.99999999999999,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 150
+			}
+		},
+		{
+			"name": "8mm_3in",
+			"material": "white_plastic",
+			"position": {
+				"x": -160,
+				"y": 1.9594348786357652e-14,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 180
+			}
+		},
+		{
+			"name": "8mm_3in_np",
+			"material": "white_plastic",
+			"position": {
+				"x": -138.56406460551017,
+				"y": -80.00000000000001,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 210
+			}
+		},
+		{
+			"name": "35mm_2in",
+			"material": "white_plastic",
+			"position": {
+				"x": -80.00000000000007,
+				"y": -138.56406460551017,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 240
+			}
+		},
+		{
+			"name": "35mm_2in_np",
+			"material": "white_plastic",
+			"position": {
+				"x": -2.9391523179536473e-14,
+				"y": -160,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 270
+			}
+		},
+		{
+			"name": "35mm_3in",
+			"material": "white_plastic",
+			"position": {
+				"x": 80.00000000000001,
+				"y": -138.56406460551017,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 300
+			}
+		},
+		{
+			"name": "35mm_3in_np",
+			"material": "white_plastic",
+			"position": {
+				"x": 138.56406460551014,
+				"y": -80.00000000000007,
+				"z": 0
+			},
+			"rotation": {
+				"x": 0,
+				"y": 90,
+				"z": 330
+			}
+		}
+	],
+	"src" : [
+		"README.md",
+		"LICENSE",
+		"scad.sh",
+		"scad/film_core.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/film_core.scad "${@}"

scad/common

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+Subproject commit e2eeb27f173d739a174c0d147bcb62a16859e2d9

scad/film_core.scad

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+use <./common/common.scad>;
+
+$fn = 200;
+
+IN = 25.4;
+InnerD = 30.6;
+
+module supports (Gauge = 16, Count = 8, OuterD = 50.8) {
+	rotate([0, 0, -13]) for (i = [0 : Count - 1]) {
+		rotate ([0, 0, i * (360 / Count)]) {
+			translate ([(InnerD / 2) + ((OuterD - InnerD) / 4) - 1, 0, 0]) {
+				cube([((OuterD - InnerD - 1) / 2), 2, Gauge], center = true);
+			}
+		}
+	}
+}
+
+module inner_core_shape (Gauge = 16, D, X, CubeW, CubeL, Pad = 0) {
+	union () {
+		cylinder(r = R(D), h = Gauge + Pad, center = true);
+		translate([X, 0, 0]) {
+			cube([CubeW, CubeL, Gauge + Pad], center = true);
+		}
+	}
+}
+
+module inner_core (Gauge = 16) {
+	difference () {
+		inner_core_shape(Gauge, InnerD, (InnerD / 2) + 0.5, 6, 7);
+		inner_core_shape(Gauge, InnerD - 4, (InnerD / 2) - 0.5, 4, 4, 1);
+	}
+}
+
+module clip (Gauge = 16, OuterD = 50.8) {
+	translate([(OuterD - 3.5) / 2, 0, 0]) {
+		rotate(45, [0, 0, 1]){
+			cube([7, 1, Gauge + 1], center = true);
+		}
+	}
+}
+
+module outer_clip (Gauge = 16, OuterD = 50.8) {
+	translate([(OuterD - 3.75) / 2, 0, 0]) {
+		difference() {
+			rotate(45, [0, 0, 1]){
+				cube([9, 4, Gauge], center = true);
+			}
+			translate([3.9, 0, 0]) {
+				cube([6, 10, Gauge + 1], center = true);
+			}
+		}
+	}
+}
+
+module outer_core (Gauge = 16, OuterD = 50.8) {
+	difference () {
+		union () {
+			difference () {
+				cylinder(r = R(OuterD), h = Gauge, center = true);
+				cylinder(r = R(OuterD) - 2, h = Gauge + 1, center = true);
+			}
+			outer_clip(Gauge, OuterD);
+		}
+		clip(Gauge, OuterD);
+	}
+}
+
+module film_core (Gauge = 16, OuterD = 50.8, Partition = true) {
+	supports(Gauge, 8, OuterD);
+	inner_core(Gauge);
+	outer_core(Gauge, OuterD);
+	if (Partition) {
+		difference () {
+			cylinder(r = R(OuterD - 1), h = 2, center = true);
+			outer_clip(Gauge, OuterD);
+			clip(Gauge, OuterD);
+			inner_core_shape(Gauge, InnerD - 3, (InnerD / 2) - 0.5, 4, 4, 1);
+		}
+	}
+}
+
+PART  = "16mm_2in";
+
+if (PART == "16mm_2in") {
+	film_core(16, 2 * IN, true);
+} else if (PART == "16mm_3in") {
+	film_core(16, 3 * IN, true);
+} else if (PART == "16mm_2in_np") {
+	film_core(16, 2 * IN, false);
+} else if (PART == "16mm_3in_np") {
+	film_core(16, 3 * IN, false);
+} else if (PART == "8mm_2in") {
+	film_core(8, 2 * IN, true);
+} else if (PART == "8mm_3in") {
+	film_core(8, 3 * IN, true);
+} else if (PART == "8mm_2in_np") {
+	film_core(8, 2 * IN, false);
+} else if (PART == "8mm_3in_np") {
+	film_core(8, 3 * IN, false);
+} else if (PART == "35mm_2in") {
+	film_core(35, 2 * IN, true);
+} else if (PART == "35mm_3in") {
+	film_core(35, 3 * IN, true);
+} else if (PART == "35mm_2in_np") {
+	film_core(35, 2 * IN, false);
+} else if (PART == "35mm_3in_np") {
+	film_core(35, 3 * IN, false);
+}