The Ducks ModsModpacks · 1.21Mods pack for the Ducks-SMP server, which is unfortunately not available

Official mod pack of the Assembly Line SMP.
Direct download from Modrinth · 12 downloads
Assembly Line S3 is a modpack made by pavle.012. Official mod pack of the Assembly Line SMP.
It supports Minecraft 1.21. It has been downloaded 12 times on Modrinth. The last update came out on Nov 7, 2026.
Assembly Line S3 has had 5 releases on Modrinth since Sep 29, 2026. 5 of them came out in the past year. The newest is 3.1.1, released on Nov 7, 2026. It is made for Minecraft 1.21.1. It runs on NeoForge. The download is 199 KB.
| Version | Released | Minecraft | Type |
|---|---|---|---|
3.1.1 | Nov 7, 2026 | 1.21.1 | Release |
3.1.0 | Nov 2, 2026 | 1.21.1 | Release |
3.0.0b4 | Oct 18, 2026 | 1.21.1 | Beta |
3.0.0b2 | Oct 16, 2026 | 1.21.1 | Beta |
3.0.0b1 | Sep 29, 2026 | 1.21.1 | Beta |
Assembly Line S3 is open source. Its newest release on GitHub is v1.1, published on Nov 1, 2026.
Full Changelog: v1.0...v1.1
Reason: Too OP.
Before that: v1.0 (Oct 22, 2026), v0.4 (Oct 18, 2026).
This is the modpack we use for the Assembly Line SMP. It’s performance and Create-focused, and most of the extras are about building things that move: ships, planes, subs, trains, and the big guns you put on them.
Sable adds proper physics to contraptions, so what you build actually flies and floats. On top of that there’s Create Aeronautics, Propulsion, Avionics, Radar, Big Cannons and Jetpack. CC: Tweaked is in too if you’d rather script your stuff, with some Sable integration so computers can talk to your vehicles. For power and production there’s New Age, Additions, Petrochem and Cobblestone, and Copycats+ for building.
Other things in the pack:
Missions: you get weekly missions (place 400 tracks, fish 16 salmon, etc.) that pay out in Numismatics currency.
Numismatics: coins and an actual in-game economy, so you can run a shop or charge people for train tickets.
Quality of life: Xaero’s minimap and world map, Simple Voice Chat, Sophisticated Backpacks, Jade, EMI and Open Parties and Claims for protecting your base.
Performance: Sodium, Iris, Lithium, ModernFix, Entity Culling and a few others, so it runs fine even with a lot of contraptions loaded.
World gen: Tectonic, Streams Reflowing and Geophilic change how the terrain looks, so you’re not just walking across vanilla hills.
It’s made for the server, but nothing stops you from loading it in singleplayer. Just know that the missions, coins and voice chat are more fun with other people around.
Needs Minecraft 1.21.1 and NeoForge. Give it 6 to 8 GB of RAM if you can.
Written by pavle.012. Read it with pictures on Modrinth.
This modpack runs on NeoForge for Minecraft 1.21. The launcher you install it with sets that up for you.
Download the .mrpack file from Modrinth.
Open it with a launcher that reads .mrpack files, such as the Modrinth App or Prism Launcher: it makes a new instance with every mod and setting of the pack.
Give the instance enough memory: most modpacks want 4 to 8 GB.
To play it with friends on a server, use the server files of the modpack if its page offers them; otherwise install the same mods on the server.
Full guide: How to install Minecraft mods
| Resource | Downloads | Versions | Last update | Price |
|---|---|---|---|---|
| 12 | 1.21 | 5 days ago | Free | |
| 6 | 1.21 | 17 days ago | Free | |
| 230K | 1.20 | Aug 12, 2026 | Free | |
| 1.5M | 1.19 – 1.21 | Jun 15, 2026 | Free |
Not yet. The newest version it supports is Minecraft 1.21.
Yes. Assembly Line S3 is free to download from Modrinth.
Yes. The last update came out in the past day.
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