diff --git a/cad/sma_rigid.json b/cad/sma_rigid.json
index e51db43..e79596b 100644
--- a/cad/sma_rigid.json
+++ b/cad/sma_rigid.json
@@ -1,7 +1,6 @@
 {
     "parameterSets": {
-        "tetrahedron": {
-            "$fn": "128",
+        "tetrahedron4": {
             "angle_max": "82",
             "angle_min": "72",
             "d_hole": "10",