diff --git a/print_tape.py b/print_tape.py
index 42d784e..404fbe3 100644
--- a/print_tape.py
+++ b/print_tape.py
@@ -45,6 +45,9 @@ def main():
     p.hw("INIT")
     # ESC V 1: 90° clockwise character rotation (not exposed by python-escpos)
     p._raw(b"\x1b\x56\x01")
+    # ESC 3 n: set line spacing to n/180 inch. Font A chars are 12 dots wide,
+    # so n=12 makes rotated characters sit flush with no gap.
+    p._raw(b"\x1b\x33\x0c")
 
     with open(csv_file) as f:
         reader = csv.reader(f)