Block Auto-Spawner.png


Name Auto-Spawner
Tool Any tool
Stackable Yes (64)
Source Mod MineFactory Reloaded

The Auto-Spawner is a machine from MineFactory Reloaded which can spawn creatures when supplied with power, Essence and a Safari Net storing a captured mob. Like any other powered MineFactory Reloaded block, it may take either IndustrialCraft 2's EU power (at any voltage), BuildCraft's MJ, Universal Electricity power or COFHs' Redstone Flux.

Its single slot is used to store the Safari Net. Mobs stored in a Safari Net (Single Use) will not work in the Auto-Spawner. While the block itself is not especially expensive nor difficult to produce, it does compensate for this by requiring a large amount of energy per spawn. Additionally, it requires Essence to run. 150 mB of Essence are required per spawn (500 mb for exact copy), while the Grinder only generates 100 mB per mob, meaning that, when using a Grinder, essence from three mobs is required to spawn two mobs with the Auto-Spawner.

For the Auto-Spawner to function, enough room has to be provided for the mob type in the Safari Net to spawn. A 9x9x5 room (with the spawner in the center on the floor) is large enough to hold most mob types, and will ensure that they do not escape.

The auto-spawner itself has an area of effect of 9 × 9 × 3 (1 block above the spawner, 1 below), meaning that you would need a 9 × 9 × 3 room to spawn say, bats without any escaping.


An Auto-Spawner being used with Conveyor Belts in a Skeleton mob farm.

It is possible to construct a fully automatic mob farm using the Auto-Spawner and other MineFactory Reloaded machines. Auto-Spawners can be used as a mob source and Conveyor Belts can transport the mobs to a Grinder, which will kill the mobs and collect their drops and essence. The essence can then either be used to supply more Auto-Spawners or an Auto-Enchanter.


  • Due to Wither Skeletons and Skeletons sharing the same mob ID, the "Spawn Exact Copy" option in the Auto-Spawner GUI has to be enabled to spawn Wither Skeletons in the Overworld.
  • The heads of the Hydra from Twilight Forest may be spawned with an Auto-Spawner, but will be passive and unable to take damage. They may be removed again with a Safari Net.
  • Cannot spawn Iron Golems.


Plastic Sheets
Magma Cream
Nether Wart
Machine Frame
Redstone Reception Coil
Plastic Sheets
Magma Cream




If melee Turtles, Autonomous Activators or other experience orb dropping machines are used to grind the mobs and these experience orbs are converted to mob essence by a Sewer, the Sewer generates 500 to 800 mB mob essence per mob. This means that, even if the Auto-Spawner is making exact copies, enough mob essence is generated to sustain the Auto-Spawner.