Most haunt props don't fail in the slicer. They fail in the yard, two nights after you set them out.

If you print FDM Halloween pieces for a driveway or porch, lock these three in before you touch supports:

1. Walls over infill. Four walls at 0.4 mm beats 30% infill every time. Wind load hits the shell. Gyroid at 12–15% is enough if the walls are there.

2. Don't auto-orient. Slicers optimize for least support, not for layer lines running with the load. A tombstone printed flat looks clean and snaps at the first gust. Stand it up, add a brim, and let the layers stack the way the wind actually hits it.

3. Dry PETG if it's going outside. PLA gets brittle after a cold night. PETG that's been sitting open for a month strings, then delaminates at the brim. A few hours in a dryer is cheaper than reprinting a 14-hour grave marker.

Print a 50 mm coupon with those settings before you commit a full prop. If the coupon flexes without cracking, the yard piece will hold.

That's the standard these files are built around.