diff --git a/cad/sma_rigid.json b/cad/sma_rigid.json
new file mode 100644
index 0000000..e51db43
--- /dev/null
+++ b/cad/sma_rigid.json
@@ -0,0 +1,69 @@
+{
+    "parameterSets": {
+        "tetrahedron": {
+            "$fn": "128",
+            "angle_max": "82",
+            "angle_min": "72",
+            "d_hole": "10",
+            "d_screw": "3",
+            "dir_thread": "[180, 0]",
+            "e": "6",
+            "hole_phi_offset": "0",
+            "mics_rotate": "[-90, 0, 0]",
+            "n_screw": "4",
+            "phi": "[0, 240, 120, 0]",
+            "r": "50",
+            "screw_phi_offset": "22.5",
+            "theta": "[0, 109.471, 109.471, 109.471]"
+        },
+        "mclaren30": {
+            "angle_max": "72",
+            "angle_min": "65",
+            "d_hole": "13",
+            "d_screw": "3",
+            "dir_thread": "[-7, -9]",
+            "e": "5",
+            "hole_phi_offset": "-5",
+            "mics_rotate": "[-90, 0, 0]",
+            "n_screw": "4",
+            "phi": "[0, 0, 90, 180, 270, 0, 63.9988, 153.999, 243.999, 333.999, 17.1086, 107.109, 197.109, 287.109, 57.7455, 147.746, 237.746, 327.746, 32.2545, 122.254, 212.254, 302.254, 72.8914, 162.891, 252.891, 342.891, 26.0012, 116.001, 206.001, 296.001]",
+            "r": "75",
+            "res": "360",
+            "screw_phi_offset": "35",
+            "theta": "[0, 90, 90, 90, 90, 180, 35.0738, 35.0738, 35.0738, 35.0738, 58.9043, 58.9043, 58.9043, 58.9043, 75.4093, 75.4093, 75.4093, 75.4093, 104.591, 104.591, 104.591, 104.591, 121.096, 121.096, 121.096, 121.096, 144.926, 144.926, 144.926, 144.926]"
+        },
+        "lebedev14": {
+            "angle_max": "82",
+            "angle_min": "75",
+            "d_hole": "10",
+            "d_screw": "3",
+            "dir_thread": "[13, 0]",
+            "e": "6",
+            "hole_phi_offset": "45",
+            "mics_rotate": "[-90, 0, 0]",
+            "n_screw": "4",
+            "phi": "[0, 0, 90, 180, 270, 0, 45, 135, 225, 315, 45, 135, 225, 315]",
+            "r": "60",
+            "res": "360",
+            "screw_phi_offset": "0",
+            "theta": "[0, 90, 90, 90, 90, 180, 54.7356, 54.7356, 54.7356, 54.7356, 125.264, 125.264, 125.264, 125.264]"
+        },
+        "popov10": {
+            "angle_max": "94",
+            "angle_min": "86",
+            "d_hole": "11",
+            "d_screw": "3",
+            "dir_thread": "[10, 10]",
+            "e": "5",
+            "hole_phi_offset": "0",
+            "mics_rotate": "[0, 0, 0]",
+            "n_screw": "4",
+            "phi": "[0, 0, 22.5, 337.5, 157.5, 202.5, 67.5, 292.5, 112.5, 247.5]",
+            "r": "50",
+            "res": "32",
+            "screw_phi_offset": "0",
+            "theta": "[0, 180, 63.4349, 116.565, 116.565, 63.4349, 116.565, 63.4349, 63.4349, 116.565]"
+        }
+    },
+    "fileFormatVersion": "1"
+}