Feed The Machine 2.0: SkyBlock Addon is addon for main modification called Feed The Machine 2.0. You will find here things like sieves, barrels, hammers and other things that will help you get something from nothing.

Modification adds:

many variants of wooden sieves;
stone sieve;
copper sieve;
iron sieve;
golden sieve;
diamond sieve;
emerald sieve;
netherite sieve;
wooden barrels;
stone barrel;
porcelain crucible;
rare resources sieve [Multiblock] [Multiblock's structure tutorial how to build is inside manual in main modification Feed The Machine 2.0: https://modrinth.com/mod/feed-the-machine-2-0]
wooden scaffolding;
stone scaffolding;
dirt bricks;
machine that creates dirt;
machine that creates oxygen;
machine that creates crystalized hydrogen;
crude steel block;
wooden hammer;
stone hammer;
iron hammer;
golden hammer;
diamond hammer;
netherite hammer;
silicon;
crude steel ingot;
plant string;
plant mesh;
wooden shears;
rare resources mix;
ruthenium, osmium, rhodium, palladium, lanthanum and iridium dust;
porcelain ball;
pebbles of stone variants;
ore chunks of ores from Minecraft and Feed The Machine 2.0.

For Rare Resources Sieve there's config for custom recipes and compatibility with KubeJS, here's simple example:

file in server scripts:

    const rrs_cobble_results = [
        "minecraft:gravel",
        "minecraft:flint",
        "ftm2_sb:rare_resources_mix",
        "ftm2_sb:silicon",
        "ftm2_sb:stone_pebble"
    ]


    rrs_cobble_results.forEach(rrs1 => {
       event.custom({
            "type": "ftm2_sb:rare_resource_sieving",
            "ingredients": [
                {
                    "item": "minecraft:cobblestone"
                }
            ],
            "output": {
                "item": rrs1,
                "count": 1
            }
        }) 
    });

config file named cobblestone.json [just like an item in script without "minecraft:"]:

  {
  "ingredients": {
    "item": "minecraft:cobblestone",
    "time": 50.0,
    "energy": 10.0,
    "water_usage": 10.0
  },
  "output": {
    "1": {
      "item": "minecraft:gravel",
      "amount": 2.0
    },
    "2": {
      "item": "minecraft:flint",
      "amount": 1.0
    },
    "3": {
      "item": "ftm2_sb:rare_resources_mix",
      "amount": 1.0
    },
    "4": {
      "item": "ftm2_sb:silicon",
      "amount": 2.0
    },
    "5": {
      "item": "ftm2_sb:stone_pebble",
      "amount": 3.0
    },
    "6": {
      "item": "minecraft:air",
      "amount": 0.0
    },
    "7": {
      "item": "minecraft:air",
      "amount": 0.0
    },
    "8": {
      "item": "minecraft:air",
      "amount": 0.0
    },
    "9": {
      "item": "minecraft:air",
      "amount": 0.0
    }
  }
}

Hammering blocks with hammer is hardcoded this way: Stone -> Cobblestone -> Gravel -> Dirt -> 50/50 for Sand or Red Sand -> Dust.

For checking drops from gravel, dirt, sand and dust from sieves check tags: ftm2_sb:block_drop_1-8 [e.x.: ftm2_sb:sand_drop_5].

Feed The Machine 2.0 [and this addon]'s discord: Feed The Machine