4x4 Post Cap
thingiverse
These are 4x4 post caps I made for our gate and fence outside. They're about as simple as you can get. I spray painted mine with that textured hammered metal stuff. It would be fun to add a gargoyle on top of them or something. Snug fit on wet posts and slides on easy for dry ones. Use a bit of construction adhesive to make sure they stay on over time.
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