Two sided TNT cobblestone farm

Stone generators on both sides make stone from lava and water, pistons push it into the middle, and TNT from a TNT duper blows it into cobblestone. Water carries the drops into hoppers that fill 84 chests. One lever starts and stops it, and it fills the chests while you stay nearby. It suits anyone who needs stone in bulk for big builds, in single player or on a server that allows TNT duping.

The timing is tight: one block or one repeater tick off and the TNT lands on the stone and wrecks the duper, and it blows itself up when its chunks unload while it runs.

• The diagram at 4:24 does not match the footage. Build 8 blocks out, then 8 to the side, and check the count against the world download. Top comment on the video.
• If the stone outruns the TNT and the duper blows up, set the first repeater in the row of 8 at 7:33 to 4 ticks. 331 likes, five builders on 1.17 to 1.21 report it.
• Switch the farm off before you leave or quit, unloading or reloading slips the timing and the TNT blows it up. A pressure plate powering a repeater in place of the lever does it for you. 652 and 549 likes.
• Use obsidian instead of glass for the top row that holds the highest lava. The TNT breaks that glass and the lava spills onto the stone. About ten builders report it.
• Set the redstone dust on the lever block to a cross, not the dot shown in the video, or the clock does not start. Four builders report it.
• On a Paper server the coral fan breaks and the TNT is not copied. Set allow-piston-duplication to true in the Paper config. Many builders report it.