AssemblyMod
by MaoMao
AssemblyMod lets a player right-click a minecart or a rail while holding the matching material to change it into that variant.
What it does
Holding a material that matches a minecart variant and right-clicking an existing minecart converts it into the corresponding minecart variant. Rails work the same way: holding the material for a rail variant and right-clicking a placed rail turns that piece into the matching rail. The swap happens in place, so a player does not need to break and rebuild the track.
The mod is aimed at players who build and maintain minecart systems, where replacing carts or rails one by one is slow. The author describes it as a convenience feature that simplifies game flow and makes the game more interesting, with the goal of bringing the behavior closer to reality. Installation needs Fabric, and the environment is client-side only, so the server does not need it. Files are published for Fabric 1.19.3 and 1.19.4, with 1.0 for 1.19.4 as the latest file, under the GNU Lesser General Public License v3.0 only, which makes the project open source.
Key features
Minecart variant swap
Right-clicking a minecart while holding the matching material converts the cart into that minecart variant.
Rail variant swap
Right-clicking a placed rail while holding the matching material converts it into the corresponding rail type.
In-place replacement
Variants are changed where they stand, so existing tracks and carts stay in their positions.
Quicker track building
Players who upgrade or adjust a route can change pieces without collecting new items for each change.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who build and run minecart transport in single-player worlds. Because the mod is client-side only, it is also useful for players who want to test the swap on their own client without asking a server owner to change anything.
How it compares
Variant Swap is a Fabric mod for Minecraft 1.20 – 1.21.5 that is client and server and open source under the GNU General Public License v3.0 only. Item Name Variants is also Fabric and client and server, but covers 1.16.5 – 26.2 and is not open source, with All rights reserved. AssemblyMod is client-side only and has the narrowest version range of the three, limited to 1.19.3 and 1.19.4, so the choice depends on the game version and whether the server needs the mod.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| AssemblyMod | Fabric | 1.19.3 – 1.19.4 | Client-side only | 2023-03-27 |
| Variant Swap | Fabric | 1.20 – 1.21.5 | Client and server | 2025-03-28 |
| Item Name Variants | Fabric | 1.16.5 – 26.2 | Client and server | 2026-08-09 |
Questions
Does AssemblyMod need to be installed on the server?
Which Minecraft versions does AssemblyMod support?
Does AssemblyMod require any other mod?
In the catalog
AssemblyMod is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 9,374 mods support Minecraft 1.19.4.
More from MaoMao
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/assemblymod
- Owner
- MaoMao
- Published
- 2023-03-27
- Updated on Modrinth
- 2023-03-27
- Facts verified
- 2026-10-15