diff --git a/.gitignore b/.gitignore
index d01b0b26523d935b5602cf057683eeea610c03ae..d0a459bb12205d23608e5afd55251598e6a603ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,9 @@ __pycache__/
 .sync/
 .idea/
 
+# Simulation input
+stl/
+
 # Simulation results
 output/
 logs/