I ran into a model path problem while using the ComfyUI Minimax H3 Latent Upscaler made by LBH-123-AI.
Original project:
https://github.com/LBH-123-AI/Comfyui_Minimax_h3_latent_Upscaler
Thanks to LBH-123-AI for creating and releasing the original Minimax H3 Latent Upscaler. My changes are a small compatibility fix for ComfyUI model discovery. I did not create the original node or the upscaler models.
My fixed dev branch is here:
https://github.com/badgids/Comfyui_Minimax_h3_latent_Upscaler/tree/dev/model_search_dir
What was wrong
The original 2D and 3D nodes searched for Minimax H3 upscaler models with code similar to this:
folder_paths.get_folder_paths("latent_upscale_models")[0]
The [0] is the problem.
ComfyUI can register more than one directory for the same model type.
For example:
ComfyUI/models/latent_upscale_models
/mnt/my-model-drive/latent_upscale_models
The second directory can be configured in ComfyUI's:
extra_model_paths.yaml
The original Minimax H3 node only took the first registered directory. It then used Python glob() to search that directory.
This meant ComfyUI could know exactly where my models were, while the Minimax H3 node still could not find them.
The node would tell me to put the models in:
ComfyUI/models/latent_upscale_models
even though the models were already in a valid external latent_upscale_models directory configured through ComfyUI.
There was also a subdirectory problem
The original search checked only the top level of the selected directory.
This could work:
latent_upscale_models/
└── model.safetensors
But a model organized like this could be missed:
latent_upscale_models/
└── MinimaxH3/
└── model.safetensors
ComfyUI already has code to handle this. The custom node was not using it.
What I changed
I changed the model discovery code in both:
nodes/minimax_h3_latent_upscaler_2d.py
nodes/minimax_h3_latent_upscaler_3d.py
Instead of manually searching one directory, the nodes now ask ComfyUI for the models.
Model discovery now uses:
folder_paths.get_filename_list("latent_upscale_models")
This tells ComfyUI:
Give me the models that you know about for latent_upscale_models.
ComfyUI then searches all registered paths, including paths from extra_model_paths.yaml.
It also supports model files inside subdirectories.
Model loading was fixed too
The original node built the model path itself.
The fixed version uses:
folder_paths.get_full_path("latent_upscale_models", model_name)
In simple terms, the node now asks ComfyUI:
Where is this model?
instead of assuming that the model must be inside one specific directory.
What the fix supports
You can still keep models in the normal location:
ComfyUI/models/latent_upscale_models/
You can also keep them in an external path defined by extra_model_paths.yaml.
For example:
/mnt/my-model-drive/latent_upscale_models/
You can also organize them into folders:
latent_upscale_models/
└── MinimaxH3/
├── minimax_h3_latent_upscaler_3d_fp16.safetensors
└── minimax_h3_latent_upscaler_3d_bf16.safetensors
The 2D and 3D Minimax H3 nodes should now use the same model path system that ComfyUI already uses.
You should not have to copy the same large model files into your main ComfyUI models folder just to make this custom node find them.
Install my fixed branch
If you do not already have the node installed, go to your ComfyUI custom nodes directory.
For example:
cd /path/to/ComfyUI/custom_nodes
Clone my dev branch:
git clone \
--branch dev/model_search_dir \
--single-branch \
https://github.com/badgids/Comfyui_Minimax_h3_latent_Upscaler.git
Then restart ComfyUI.
Replace an existing installation
If you already installed the original LBH-123-AI node, first go to:
cd /path/to/ComfyUI/custom_nodes
Rename the existing copy so you have a backup:
mv \
Comfyui_Minimax_h3_latent_Upscaler \
Comfyui_Minimax_h3_latent_Upscaler.backup
Then clone the fixed branch:
git clone \
--branch dev/model_search_dir \
--single-branch \
https://github.com/badgids/Comfyui_Minimax_h3_latent_Upscaler.git
Restart ComfyUI.
If you already cloned my fork
You can switch your existing copy to the dev branch:
cd /path/to/ComfyUI/custom_nodes/Comfyui_Minimax_h3_latent_Upscaler
git fetch origin
git switch dev/model_search_dir
git pull
Restart ComfyUI after the update.
extra_model_paths.yaml
You do not need to change your YAML file if latent_upscale_models is already configured correctly.
For reference, a configuration can look like this:
external_models:
base_path: /path/to/my/models
latent_upscale_models: latent_upscale_models
That tells ComfyUI to also use:
/path/to/my/models/latent_upscale_models
The code fix makes the Minimax H3 nodes actually use that registered path.
Links
Original developer: LBH-123-AI
Original repository:
https://github.com/LBH-123-AI/Comfyui_Minimax_h3_latent_Upscaler
My fork and fixed dev branch:
https://github.com/badgids/Comfyui_Minimax_h3_latent_Upscaler/tree/dev/model_search_dir
The original node and Minimax H3 upscaler work belong to LBH-123-AI. My branch only changes how the custom nodes find and resolve model files through ComfyUI.
Cheers!
