This instructable will show you how to make automatic 10/20/30 lvl enchant table in minecraft ...
Step 1: Base
Step 2: Make First Automatic 10 Lvl Enchant
Step 3: Make Automatic 20 Lvl Enchant
Step 4: Make Automatic 30 Lvl Enchant
Step 5: Place Bookshelfs on the Pistons
Step 6: Make Room and Place Enchant Table in Middle
Step 7: Done!
Step 8: Result
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