Minecraft 3x3 piston doorway

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What is the most compact and simple way of making in Minecraft a 3x3 piston door?
Best Answer
If you don't want to use slime blocks, and you don't mind having a 3x3 door without the center block, Etho's door design is probably one of the best out there. It opens quick enough that you can sprint through it without it breaking your sprint, and it is quite simple to build. Link.
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How to Make a 3x3 PISTON DOOR in Minecraft 1.16 (Two-way, Easy)
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