Blueprints and copying builds

Copying a region

Press B to start a blueprint. Left click one corner of the region, then right click the opposite corner. The region can be up to 64 blocks along each edge. Liquids are left out of a copy, so a pond is not copied as water. Each copy takes its name when you save it, up to 40 characters.

Pasting

Pick a blueprint from your library and place it. The blueprint turns in quarter steps as you paste, so a wall copied facing east can go in facing north. Its lowest corner lands where you aim. Doors are kept whole: a door in a blueprint carries its top half with it, and the top half is not charged twice.

A paste is one step for undo, so Ctrl+Z takes the whole paste back in one go.

What a paste needs

Before you paste, the blueprint shows a list of the materials it needs and how many are in your bag. The most needed material is listed first, so you can see at a glance what is short.

Machines in a blueprint are counted apart from building material. Each machine is paid for by its own recipe where it stands, so a blueprint with a generator in it will ask for the generator's metal and stone as well as its blocks.

Sharing

A blueprint can be shared as a line of text, which starts with CWBP1:. Copy it and paste it into another player's blueprint screen to get the same build. A blueprint can also be saved as a file with the .cwbp extension and sent the same way. Your library of blueprints is kept in the browser on your device, so it stays with that browser and does not follow you to another one unless you share the text.

Symmetry

Symmetry is separate from blueprints and works with any build tool. Press N to cycle symmetry off, mirror across X, mirror across Z, or both. Each placement is mirrored through the block you first aim at, and shapes with a front turn to face the mirror. Corner stairs are handed the other way when mirrored, so the mirrored corner still fits. Full detail is on the building tools page.

Tips

• Copy a room once, then paste it turned to make a row of identical rooms.
• Use the materials list before a big paste so you know what to gather first.
• If a paste is short, collect what is missing, then paste again.
• Share a blueprint as text when you want to send it in chat, and as a file when you want to keep it.

For the building blocks a blueprint can contain, see building pieces and shapes. For machines and the power they need, see machines and power.

← Back to the wiki · Last updated 25 October 2026. Mantlenaut is in alpha, so things change.