Simple mod to eat up a lot of block IDs. Used to reproduce a bug with chisel and just enough IDs.

BlockIdEater.java

package net.xalcon.blockideater;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

@Mod(modid = BlockIdEater.MODID, name = BlockIdEater.NAME, version = BlockIdEater.VERSION)
@Mod.EventBusSubscriber
public class BlockIdEater
{
    public static final String MODID = "blockideater";
    public static final String NAME = "BlockIdEater";
    public static final String VERSION = "1.0";

    @SubscribeEvent
    public static void onRegisterBlocks(RegistryEvent.Register<Block> event)
    {
        for(int i = 0; i < 3950; i++)
        {
            event.getRegistry().register(
                    new Block(Material.CLAY)
                            .setRegistryName(MODID, "block" + i)
            );
        }
    }
}