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Once you're happy with your design, simply exiting the workshop will save it and create the detail block to build with. To select it, open up your Block Select screen ('=') and select your new design to a hotbar slot. You can quickly find all detail block designs by filtering for 'detail block' in the filter list. You can now start a new design in the workshop by pressing 'Y', or by building a new workshop. You can have up to 16384 detail block designs in one world!

Placing detail blocks

To place a detail block, build it like you would any other block. The design will attach to the face you have selected, and be rotated to face towards you. This allows you to place detail blocks in any orientation you want.

If you use thousands of detail blocks in the same area, you will notice significant performance drops. This is because all those details have to be rendered by your graphics card. To alleviate this, use detail blocks of lower resolutions and use normal blocks where ever you can.

Super Build

This allows you to quickly build simple geometric shapes using any block you have selected. To use the Super Build, first select a shape to build using F9. With F10 you can select if it should build a solid or hollow shape. With F11 you toggle the build mode. Instant will get you the fastest result, but can result in some holes for very large shapes. End toggles between the anchor of the shape being centered or on the bottom middle of the shape.

X, Y and Z allow you to change the size of the shape. Pressing them increases that dimension by 1. Hold shift and press X, Y or Z to decrease by one. You can additionally hold ALT to change the size by 16 at a time.

Once you've chosen a shape, size and location, press Ins to build the shape, or Del to dig it out. You will then have to reselect a shape to dig or build again.

Copy Paste

The Copy Paste tool allows you to quickly copy part of a design you've made, rotate or flip it around, and paste it back into the world in whatever place you want. Open the copy paste panel by pressing F11.
The Copy Paste panel is currently UNDER CONSTRUCTION, which is why it doesn't look like the rest of the interface.