This is a simple tutorial on how to build a block swapper in Minecraft!
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Step 1: Pistons
Add two sticky pistons, facing each other 3 blocks away. Add a sticky piston between.
Step 2: Blocks
Place your two chosen blocks next to the right piston.
Step 3: Power
Add two wood planks above the block in front of the sticky piston. Add a button on the top plank.
Step 4: Redstone Torch
Add a redstone torch directly behind the button.
Step 5: Blocks 2
Add four blocks one block down beside the redstone torch.
Step 6: Redstone
Add redstone dust to the furthest block from the torch, and repeaters back to back on the other.
Step 7: Redstone Torches 2
Add two redstone torches on the block above the piston. They should automatically turn off.
Step 8: Wall
Add a wall around to cover up the redstone.
Step 9: Done!
You have completed your redstone block swapper. Design it however you want!