by mars·Workflow
Images © mars. Used for product review; image policy.
Slot Link earns a spot in the blender_extensions library for automating a specific chore: keeping Actions and Slots linked correctly across projects with several separate animations, without manual tracking.
Slot Link is a Blender add-on by mars aimed at projects that contain multiple separate animations. It handles the unlinking and linking of Actions and Slots automatically, so you don't have to track which Action goes with which Slot yourself. When you need to re-apply an Action, pressing Link Slots does the work.
The add-on lets you specify what Actions and Slots are animating. It requires Blender 4.5 or higher and works with Blender 4.5 LTS and newer. Note that it is not compatible with legacy Actions, so projects relying on the older Action system fall outside its scope.
Released under the GNU General Public License v3.0 or later, Slot Link requires no special permissions. Version 0.0.12 includes a bugfix for when a slot was deleted and adapts the development workflow using bpydev to be editor or IDE independent. Documentation is available on the developer's page, and the add-on sits at rank 615 in the blender_extensions library.
Slot Link is best for blender users working on projects that contain multiple separate animations and need to manage how Actions and Slots link together.
Slot Link is completely free to download and use.
Slot Link requires Blender 4.5 or higher and is listed as compatible with Blender 4.5 LTS and newer, so a current 4.5 install meets its baseline. One important caveat: Slot Link is not compatible with legacy Actions, so if your project relies on the older Action system rather than the Actions-and-Slots setup, the add-on won't apply. Blender versions older than 4.5 are not supported. Check the developer's documentation for the full user guide before setting it up on an existing project so you know what to expect.
Slot Link is released under the GNU General Public License v3.0 or later, and it is listed as free here in the catalog. The add-on also requires no special permissions when installed. For the current terms, the exact license text, and any details around usage or redistribution under the GPL, refer to the developer's page. Because licensing and distribution details can change over time, treating the developer's page as the authoritative source is the safest approach before you build the add-on into a larger project or pipeline.
Slot Link installs the same way as other Blender extensions. You can drag and drop the add-on directly into Blender, or download the package and use Blender's Install from Disk option. The download is a compact 61.1 KB, so it adds little weight to your setup. After installation, you can specify what Actions and Slots are animating and press Link Slots to re-apply an Action. The developer's documentation includes a user guide that walks through setup and usage in more detail if you get stuck.
Slot Link does not support legacy Actions. It works with the Actions and Slots system and automates the unlinking and linking between them, but projects built on the older legacy Action workflow fall outside what it can handle. This connects to its version requirement, since the add-on needs Blender 4.5 or higher. If you are working in Blender 4.5 LTS or newer with Actions and Slots, the add-on applies; older Action-based setups are not covered, so plan your animation workflow with that limitation in mind.
Slot Link version 0.0.12 includes a bugfix for when a slot was deleted. This release also adapts the development workflow using bpydev to be editor or IDE independent. The extension does not require special permissions to install or run. For the complete version history and any releases that follow this one, the developer's page and documentation list what has changed across versions, so it is worth checking there for the most current build and details before updating an existing setup.
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