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diff --git a/supports/runner.scad b/supports/runner.scad
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+
+/*
+This file is used in models found in this repository.
+Copyright (C) 2024 Christian Hodgden
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser 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.
+
+You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+/*
+This file can be used in an openscad file with `use`.
+```OpenSCAD
+	use <runner.scad>;
+	runner(200, 300);
+```
+
+This file can be called directly on the command line passing specified arguments.
+```shell
+openscad runner.scad -D 'length=200' -D 'width=300' -o runner.stl
+```
+
+This file can also be copied, edited, and compiled with the desired arguments.
+*/
+
+// OpenSCAD's default unit is millimeter
+module runner (length, width, frequency=10, thickness=1, height=0.1) {
+	for (i = [0:frequency:width]) {
+		translate([0, i, 0])
+			cube([length+thickness, thickness, height]);
+	}
+	for (i = [0:frequency:length]) {
+		translate([i, 0, 0])
+			cube([thickness, width+thickness, height]);
+	}
+	translate([0, width, 0])
+		cube([length+thickness, thickness, height]);
+	translate([length, 0, 0])
+		cube([thickness, width+thickness, height]);
+}
+
+length = 150;
+width = 100;
+frequency = 10;
+thickness = 1;
+height = 0.1;
+
+runner(
+	length = length,
+	width = width,
+	frequency = frequency,
+	thickness = thickness,
+	height = height
+);