diff --git a/monitor/modelo.py b/monitor/modelo.py
index 5fa524f..aa1a0c0 100644
--- a/monitor/modelo.py
+++ b/monitor/modelo.py
@@ -71,7 +71,7 @@ screen_base = (
     .lineTo(0, height)
     .close()
     .extrude(length)
-    .faces("<X")
+    .faces(">X")
     .shell(-shell_t)
     .edges("|X")
     .fillet(fillet_s)