Flying machine bamboo farm

A full size bamboo farm by KelpMC. Around 600 bamboo plants sit in one flat field with a slime block flying machine sweeping back and forth across the top, snapping every stalk it passes, and a fleet of twenty hopper minecarts running the rails underneath to sweep the drops into a six chest storage wall. A note block with an observer on it starts the machine off. It is a big, expensive, genuinely automatic build rather than a starter farm, and it is Java only.

Every block the slime touches has to be one slime cannot stick to. Leaves are what KelpMC uses, obsidian and glass also work as long as the last slime block in each line is swapped for something else. This is the single most common reason the machine stops halfway.
Stop the farm before you go through a nether or end portal. lossantosy2 warns the machine halts while you are away, the bamboo grows to full height around it, and getting it running again means cutting all of it by hand and pulling the redstone out.
Put a lever on any of the obsidian to switch the farm off cleanly. manitshukla568 powers it to stop and unpowers it to start again.
If the machine will not move at all, it is too long for the piston push limit. IllllllllIIIIllllIIIlllIIlll fixed it by removing about two slime blocks from each side, and ErenErtugrul hit the same wall on a server with a lower limit.
Honey blocks work in place of slime if they are easier to get, though KelpMC warns some items will stick to them.
Edykurwa waterlogs slabs on every second row when filling the big hole, so water cannot run down and wash the rails out.