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I am playing a custom map and I have 2 mob spawners in which I have set up traps for. These traps lead to the same place, however both spawners are considerably far away from each other and therefore only one spawns at a time (when I am near).

I was wondering if there was some sort of way to "mimic" a player position without a player actually being there. What I would usually do is start up another computer and simply open it to LAN and have another account be somewhere next to the spawner, however I was wondering if there was a way to not have to do this? Is this possible? Are there any mods that allow this?

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If you're up for modding, then I guess you're up for just editing the map!

You can adjust the Mob Spawner TileEntity Field for RequiredPlayerRange to something higher. This can be done with an MCEdit filter, there are a few of Texelelf's Filters that could do the job.

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    Thankyou :). I used the Unified Spawner Filter by Texeleif for people wondering. – GoodPie Jul 16 '13 at 11:16
  • to add to this answer, spawners have a "box" around them for detection. Using editors you can move this box, and change its size (data is stored in nbt tags). – legacy Jul 16 '13 at 14:20
  • @legacy I don't think that's correct. It's not a box, it's a radius that defines a sphere. – fredley Jul 16 '13 at 14:21
  • There is no need for MCEdit any more. Tile entity fields can be set using /setblock or /blockdata commands. – MrLemon Mar 13 '16 at 9:18
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You really don't need any mods or any external program to do this! Do it straight from vanilla Minecraft via the /setblock command. Simply add the tag RequiredPlayerRange followed by the amount of blocks, and the command should look something like this:

/setblock (x) (y) (z) minecraft:mob_spawner 0 replace {RequiredPlayerRange:(blocks)} 

More info can be found watching Dragnoz's video here:

Hope this helps!

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To edit the spawn distance of mob spawner in 1.13 and above the command will be:

/data merge block (x) (y) (z) {RequiredPlayerRange: (amount)} 

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