Understanding the Giant Contraption Problem in Minecraft
Minecraft’s creative and technical communities have always pushed the game to its limits, building enormous flying machines, moving factories, and sprawling redstone contraptions. One of the most exciting ways to do this is with mods that allow players to carry and render massive structures in real time. However, a long-standing vanilla limitation has frustrated builders for years: the playerdata cap. If you have ever tried to move a colossal contraption only to be greeted by a crash or a blank, unrendered mess, you have encountered the infamous bug MC-185901.
What Exactly Is MC-185901?
In vanilla Minecraft, the game stores a player’s carried block data, such as the contents of a moving contraption, inside a network packet. The maximum size of that packet is hardcoded to roughly 2MB. When a contraption becomes too complex—think hundreds of blocks, tile entities, inventories, and intricate connections—the data exceeds that limit. The server cannot send the full information to the client, causing chunks of the contraption to simply vanish from your screen. You might see floating entities, missing blocks, or a complete visual breakdown. For anyone who loves designing big machines, this bug is a creativity killer.
Introducing Create: Big Contraptions
Despite the name, Create: Big Contraptions is not an addon for the Create mod. It does not depend on Create in any way. The mod earned its title because it directly addresses the rendering issues that players often encounter with large contraptions—especially those carried by the player, a scenario heavily associated with Create’s moving structures. Its sole purpose is to fix MC-185901 by dramatically increasing the playerdata packet size limit from the vanilla 2MB to a generous 10MB. This fivefold boost is often enough to render even the most ambitious creations without a hitch.
How the Fix Works
The mod is entirely client-side, meaning you only need to install it in your own game folder—no server-side changes required. It intercepts the network code responsible for assembling and transmitting playerdata, then applies a patch that raises the threshold. Under the hood, the fix is inspired by a feature originally found in XLPackets for Minecraft 1.16. The developer ported that packet size enhancement into a standalone, client-only solution, making it lightweight and easy to adopt. Unlike XLPackets, which sometimes required server installation, Create: Big Contraptions leaves your multiplayer server untouched.
Why 10MB Matters for Builders
Moving from 2MB to 10MB opens up a world of possibilities. A contraption that previously would have broken visually now renders in full detail. This includes not just the blocks themselves but also the tile entities—chests, furnaces, create components—and any attached inventories. The result is a seamless, immersive experience where your flying castle, mobile factory, or colossal drill actually looks and behaves the way you designed it. The mod is especially valuable on servers where multiple players might be carrying large machines simultaneously, as the client-side nature prevents any conflict with other players’ setups.
Installation and Compatibility
Getting the mod running is straightforward. Since it is a client-only mod, you simply drop the .jar file into your Minecraft mods folder, provided you are using a compatible mod loader like Fabric or Forge (depending on the version). There are no dependencies to worry about, and it does not interfere with other mods that alter rendering or networking. If you prefer a hassle-free way to manage mods, the foxygame.net launcher lets you browse and install mods like Create: Big Contraptions directly from its built-in menu, making the whole process smooth and modern. The launcher handles version matching and mod loader selection automatically, so you can jump straight into building without fiddling with file directories.
Limitations and Considerations
While 10MB is a significant upgrade, it is not infinite. Extremely massive contraptions with thousands of complex tile entities could still hit the new cap. However, for the vast majority of player-carried machines, this fix eliminates the rendering bug entirely. Keep in mind that the mod does not improve server performance or reduce lag—it only ensures that the client receives the full visual data. If your contraption causes server-side lag due to its sheer size, that is a separate issue. Additionally, because the mod is client-only, every player who wants to see the big contraptions properly must install it themselves. It is a small, targeted tool that solves one specific, painful problem.
Why This Mod Stands Out
The Minecraft modding scene is full of massive overhauls and content packs, but sometimes the most impactful mods are the tiny, focused fixes. Create: Big Contraptions does not add new blocks or mechanics; it simply removes a barrier that has stifled creativity for years. By addressing MC-185901 head-on, it empowers players to share and showcase their grandest designs without the fear of visual corruption. The fact that it requires no server installation makes it incredibly accessible for casual multiplayer sessions, public servers, and singleplayer worlds alike.
Conclusion
If you have ever watched your carefully constructed moving base dissolve into a glitchy mess, Create: Big Contraptions is the solution you have been waiting for. By raising the playerdata limit to 10MB, this client-only mod restores visual fidelity to large contraptions and lets your imagination run wild. It is a perfect example of how a small, well-crafted fix can have an outsized impact on the Minecraft experience. Pair it with your favorite building mods, and you can finally carry the impossible without compromise. Next time you plan a monumental moving structure, make sure this mod is in your toolkit—your eyes will thank you.