The Copper Wall is a copper-red building-block with parallel bands on four sides and caramel-brown stucco with a copper frame on two sides.
It can be crafted in your Crafting Menu (default key "Q") or at any Crafting Table in worlds created before R22 on September 16th 2015, after the recipe has been unlocked upon taking/crafting a Stucco Wall for the first time (which is unlocked by taking/mining soft brown Canyonstone, found high up in Canyons-biomes), which will need at least a Stone Mining Cell.
To craft 8 (blocks of) Copper Walls, you'll need (as of R24 in November 2015):
- 2 Iron Bars made in a Forge from Iron Ore
- 2 Obsidian Rods made of Obsidian (bars) in a Processor or found in Iron Treasure Chests or Diamond Treasure Chests
- 4 (blocks of) caramel Canyonstone mined/pulled from the blocks forming the landscape of Canyons-biomes (not Dark Canyonstone nor Ruddy Canyonstone), which will need at least a Stone Mining Cell
- 1x Melted Wax made of Beeswax in a Forge or looted from Wood Treasure Chests or Stone Treasure Chests