Most Halloween STL “yard props” look great on a desk and snap in a breeze.

If you’re printing for a real lawn, not a render:

• Walls beat infill. 3–4 walls. 15% infill is enough if the walls are doing the work.

• Orientation is the whole game. Tombstones and signs go flat on the widest face. Don’t stand them up “because that’s how they sit in the yard” — you’ll get a weak layer line right where the wind hits.

• Sun eats cheap PLA. Indoor PLA is fine for a porch. Anything that sits in daylight for a week wants PETG.

• Scale before you fall in love with the file. A 400 mm grave marker that fit the designer’s 350 mm bed is not print-ready. Check the bounding box in the slicer first.

That’s the bar I use on every file in the Halloween pack: it has to survive a hobby FDM machine and a backyard, not just look haunted on a thumbnail.