commit 030c0175447b09880d609c01aa8d5fef51aadfb8
Author: Brandon Dyck <brandon@dyck.us>
Date:   Sun Jul 21 17:37:52 2024 -0600

    First commit

diff --git a/LICENSE.txt b/LICENSE.txt
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+Copyright © 2022 Brandon Dyck
+
+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.
diff --git a/README.txt b/README.txt
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+Place value blocks
+-------------------
+
+Requires OpenSCAD. You can set the following with the Customizer tool in OpenSCAD and Thingiverse:
+- Unit cube width (default 10mm, which seems standard)
+- Groove depth
+- Cube count: preset unit, ten, hundred, or thousand block, or use custom counts in all three dimensions
+
+See LICENSE.txt for copyright information.
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diff --git a/place value block.scad b/place value block.scad
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+// For “custom”, you must also set the “dimensions” parameter.
+shape = "flat"; // [unit,rod,flat,cube,custom]
+
+groove_depth = 0.8; // [0:0.1:3]
+
+unit_size = 10; // [0:0.1:40]
+
+/* [Custom dimensions] */
+
+dimensions = [2,3,4];
+
+module __Customizer_Limit__ () {}
+
+actual_dimensions = shape == "cube" ? [10,10,10] :
+	shape == "flat" ? [10,10,1] :
+	shape == "rod" ? [10,1,1] :
+	shape == "unit" ? [1,1,1] : dimensions;
+
+module cube_block(x_count, y_count, z_count, cube_width=10, groove_depth=0.8) {
+	
+	module corner_chamfer() {
+		linear_extrude(2*groove_depth*sqrt(2))
+			polygon([
+				[-groove_depth*sqrt(2),-groove_depth],
+				[0,0],
+				[groove_depth*sqrt(2),-groove_depth]]);
+	}
+	
+	module grooves(length, count) {
+		for (x = [0:cube_width:count*cube_width]) {
+			translate([x,0,0]) {
+				// Make sure the edges overlap with the cube.
+				extra_depth = groove_depth*0.01;
+				extra_length = length*0.01;
+				translate([0,0,-extra_length/2])
+					linear_extrude(length+extra_length)
+					polygon([
+						[-groove_depth-extra_depth,-extra_depth],
+						[0,groove_depth],
+						[groove_depth+extra_depth,-extra_depth]]);
+				
+				translate([0,2*groove_depth,0])
+					rotate([45,0,0])
+					corner_chamfer();
+				translate([0,2*groove_depth,length])
+					mirror([0,0,1])
+					rotate([45,0,0])
+					corner_chamfer();
+			}
+		}
+	}
+	
+	x_width = x_count * cube_width;
+	y_width = y_count * cube_width;
+	z_width = z_count * cube_width;
+	
+	difference() {
+		cube([x_width,y_width,z_width]);
+		
+		grooves(z_width, x_count);
+		translate([0,y_width,0])
+			mirror([0,1,0]) grooves(z_width, x_count);
+	
+		mirror([0,-1,1]) {
+			grooves(y_width, x_count);
+			translate([0,z_width,0])
+				mirror([0,1,0]) grooves(y_width, x_count);
+		}
+		mirror([1,-1,0]) {
+			grooves(z_width, y_count);
+			translate([0,x_width,0])
+				mirror([0,1,0]) grooves(z_width, y_count);
+		}
+		mirror([-1,0,1]) mirror([1,-1,0]) {
+			grooves(x_width, y_count);
+			translate([0,z_width,0])
+				mirror([0,1,0]) grooves(x_width, y_count);
+		}
+		mirror([-1,0,1]) {
+			grooves(x_width, z_count);
+			translate([0,y_width,0])
+				mirror([0,1,0]) grooves(x_width, z_count);
+		}
+		mirror([1,-1,0]) mirror([-1,0,1]) {
+			grooves(y_width, z_count);
+			translate([0,x_width,0])
+				mirror([0,1,0]) grooves(y_width, z_count);
+		}
+	}
+};
+
+cube_block(actual_dimensions.x, actual_dimensions.y, actual_dimensions.z, cube_width=unit_size, groove_depth=groove_depth);
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