ImageOnlyCheckpointLoader_motorway_edition

Most checkpoints bundle a diffusion model, a text encoder and a VAE. "Image-only" checkpoints skip the text encoder - they're diffusion model + CLIP vision + VAE, designed for models that condition on a reference image instead of a prompt. That's the Stable Zero123 / SV3D family and friends. ImageOnlyCheckpointLoader_motorway_edition is the stock loader for those, wrapped for the MOTORWAY 🚌💨 pipe in agilly1989/ComfyUI_agilly1989_motorway.

It's the odd one out in this pack in a good way: it has no input keys. Nothing needs to be read out of the pipe - the only widget is ckpt_name, the dropdown that lists checkpoints from ComfyUI/models/checkpoints. It loads the file and writes all three components into the pipe.

The output keys that matter

• OUTPUT_MODEL_key (default "MODEL") - the diffusion model
• OUTPUT_CLIP_VISION_key (default "CLIP_VISION") - the vision encoder
• OUTPUT_VAE_key (default "VAE") - the autoencoder

Because it has no reads, the MOTORWAY socket is marked optional in the schema, so it can serve as a starting point for a pipe. One honest caveat from the wrapper code: it pops the Motorway unconditionally, so in practice keep a pipe connected even though the socket is optional - the node is happier that way. Three values go into the pipe, and the node's only visible output is the Motorway itself.

How it works

Standard *_motorway_edition mechanics: pop the Motorway, run stock ImageOnlyCheckpointLoader with the chosen checkpoint, then store each return value under its matching output key and hand back a cloned pipe. From there, downstream nodes pull "MODEL", "CLIP_VISION" and "VAE" out by key - which is exactly what this pack's ImageOnlyCheckpointSave does in reverse.

Installing

cd ComfyUI/custom_nodes
git clone https://github.com/agilly1989/ComfyUI_agilly1989_motorway

Restart ComfyUI, or install via ComfyUI Manager (search "motorway"). No requirements.txt; the only thing to download is the image-only checkpoint itself, which this node doesn't provide.

Gotchas

Don't confuse this with the pack's ImageOnlyCheckpointSave_motorway_edition - that one writes files, this one loads them. And the family health warning: it's BETA, and the motorway_edition clone set is currently disabled in the 1.1.7 hotfix, so if the node isn't in your menu, stock ImageOnlyCheckpointLoader does the same job with regular wires.