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I want it so that when an anvil gets used up, it will put another one in it's place. Someone told me to use /execute @a ~ ~ ~ detect ~ ~-1 ~ minecraft:snow 0 /setblock ~ ~-1 ~ minecraft:air 0 , but it says

"/setblock is not a valid number"

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    That command should work, if you type it exactly as written, but it does something entirely different from what you ask: It replaces snow blocks below any player with air.
    – MrLemon
    Commented Aug 26, 2016 at 7:50
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    Is this only one anvil (e.g. for an adventure map), or is this any anvil placed anywhere in the world?
    – MrLemon
    Commented Aug 26, 2016 at 7:51
  • The command itself worked perfectly fine for me. Although I'm not 100% sure what you want to do as you talk about anvils then use an example that removes snow below the player's feet, maybe explain your goal a bit more? Where is the anvil you want replaced, should it be replaced when it breaks or when it's damaged but not completely broken?
    – Hoi_A
    Commented Aug 27, 2016 at 11:17

2 Answers 2

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If I understand correctly... You want to refill the anvil when it's broke. So use this

/execute @e[name=Anvilblock,type=ArmorStand] ~ ~ ~ detect ~ ~ ~ air 0 /setblock ~ ~ ~ anvil

The lever is only for toggle It would test for every ArmorStand that named "Anvilblock" And if you want self-repair anvil just stand on where you want it to be placed and do 

/summon ArmorStand ~ ~ ~ {CustomName:Anvilblock,Invisible:1,Marker:1}

Invisible make it invisible and Marker make It's hitbox's size to 0. And when you don't want it anymore, Stand near it and do

/kill @e[type=ArmorStand,name=Anvilblock,r=2]

Be sure to turn off commandBlockOutput in /gamerule

Hope that's help!

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This should work. It doesn't detect for ANY anvil, only one at a specific coordinate, but it will work. enter image description here Take a repeating command block (always active) and place in the command /testforblock <coords> anvil <data value1>, then place a chain command block (conditional) with /setblock <coords> anvil <data value2>

Now you'll have to find the coords yourself, but for the data values:

  • Data Value 1: 1 ; Data Value 2: 9
  • Data Value 1: 2 ; Data Value 2: 10
  • Data Value 1: 3 ; Data Value 2: 11

These are all your options for the data values, but they must be used together as a pair. Use whatever combination fits your scenario best.

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