Update .github/workflows/openscad-render.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: dorkmo

.github/workflows/openscad-render.yml

@@ -97,7 +97,7 @@ jobs:
           # Top margin: max arm height should reach near top with small margin
           # Height range to capture: 0 to MAX_ARM_TIP_HEIGHT
           SCENE_HEIGHT=$MAX_ARM_TIP_HEIGHT
-          MARGIN_FACTOR="1.75"  # 75% additional space around assembly for better visibility of full arm range of motion
+          MARGIN_FACTOR="1.75"  # Margin factor 1.75× provides 75% total additional space (37.5% margin on top and bottom) for better visibility of full arm range of motion
           
           # Center point: halfway between ground and max height, at wheel midpoint Y
           CENTER_Y=$WHEEL_MIDPOINT_Y