The merchant grinder is a somewhat large grinder, and is a continuously “work in progress”. Spanning from height 35 to height 82 (for now). Last time statistics of the grinder was collected, it generated about > 1 gunpowder a minute. Please feel free to contribute to the grinder by adding floors, making better water-flow engineering, etc. Be aware of creepers, tho. Since all rooms are dark, destroying the complex while working on it is a known hazard. Use it by warping to the warp point grind, and just idle at the end of the water flow.
The merchant grinder has now been removed from the server as it ground the server to a halt.