Initial commit

.gitignore

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+*.stl

Lego.json

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+{
+    "parameterSets": {
+        "Brick_4x2": {
+            "type": "1",
+            "studs_x": "4",
+            "studs_y": "2"
+        }
+    },
+    "fileFormatVersion": "1"
+}

Lego.scad

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+/* [Lego Type] */
+type = 1; // [1:Standard]
+studs_x = 4;
+studs_y = 2;
+
+/* [Hidden] */
+block_height = 9.6; // The height of the block without studs
+length_per_stud = 31.8 / 4;
+stud_details = 4 * ($preview ? 5 : 10);
+wall_width = 1.4;
+ceiling_width = 1;
+
+module stud() {
+	cylinder(d = 4.8, h = 1.8, $fn = stud_details);
+}
+
+module studs() {
+	for (x = [0:studs_x-1], y = [0:studs_y-1])
+	translate([(x+0.5) * length_per_stud, (y+0.5) * length_per_stud, 0])
+	stud();
+}
+
+module base() {
+	difference() {
+		cube([ studs_x*length_per_stud, studs_y*length_per_stud, block_height ]);
+		translate([wall_width, wall_width, -ceiling_width]) {
+			cube([
+				studs_x*length_per_stud - wall_width * 2,
+				studs_y*length_per_stud - wall_width * 2,
+				block_height
+			]);
+		}
+	}
+}
+
+module pillar() {
+	cylinder(h = block_height, d = 6.51, $fn = stud_details);
+}
+
+module pillars() {
+	if (studs_x >= 2 && studs_y >= 2) {
+		for (x = [0:studs_x-2], y = [0:studs_y-2])
+		translate([(x+1) * length_per_stud, (y+1) * length_per_stud, 0])
+		pillar();
+	}
+}
+
+module block() {
+	base();
+	pillars();
+	translate([0, 0, block_height])
+		studs();
+}
+
+block();

Makefile

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+PARAMETERS := $(shell cat Lego.json | grep -v '"parameterSets": ""' | jq -r '.parameterSets | keys[]')
+STL = $(PARAMETERS:%=%.stl)
+
+all: $(STL)
+
+$(STL): Lego.scad Lego.json
+	openscad -o $@ -P $@ $<
+