HopperLock

HopperLock is a lightweight Minecraft plugin that makes hopper-based item filters simpler and more compact.

Instead of relying on complicated redstone filter setups, HopperLock allows you to lock items directly inside a hopper. When a hopper is locked, one item will always remain in each occupied slot, while any excess items can continue to flow through the hopper normally.

For example, a locked hopper containing:

Iron ×32 | Gold ×16 | Diamond ×8 | Redstone ×20 | Coal ×64

will continue transferring items until it reaches:

Iron ×1 | Gold ×1 | Diamond ×1 | Redstone ×1 | Coal ×1

The final item in each locked slot is preserved, allowing the hopper to remember which items belong in each slot and making it ideal for building simple, compact item sorting systems.

Features

• Lock hopper slots with a simple command
•  Keeps 1 item in every occupied slot
• Excess items continue transferring normally
• Empty slots remain unrestricted
• Locks persist across server restarts
• Designed for compact item filtering systems
• Lightweight and easy to use

Simply fill the hopper with the items you want to reserve, look at the hopper, and use /hopperlock.