diff --git a/src/util/flat.scad b/src/util/flat.scad
index dd1dc2c9..f7af5b7d 100644
--- a/src/util/flat.scad
+++ b/src/util/flat.scad
@@ -1 +1,3 @@
-function flat(lt) = [for(row_pts = lt) each row_pts];
\ No newline at end of file
+function flat(lt, depth = 1) =
+    depth == 1 ? [for(row = lt) each row] :
+                 [for(row = lt) each flat(row, depth - 1)];
\ No newline at end of file