aigen/docs/qwen21.md

Qwen Image 2.1 (engine qwen21) — host weights + Comfy graph

Host paths (this RTX 5080 box)

Role	Resolved path
ComfyUI root (Klein / host agent ComfyUI (1))	C:\Users\ianjm\AppData\Local\Comfy-Desktop\ComfyUI-Installs\ComfyUI (1)\ComfyUI
Models root (Desktop Shared via shared_model_paths.yaml)	C:\Users\ianjm\AppData\Local\Comfy-Desktop\ComfyUI-Shared\models

Weights must land under Shared so every Desktop instance sees them:

• diffusion_models\qwen-image-2.1-Q8_0.gguf (~7.59 GiB) — from abenzerps/Qwen-Image-2.1-Uncensored-GGUF
• text_encoders\qwen3vl_8b_int8_convrot.safetensors — from Comfy-Org/Qwen-Image-2.1 (INT8; BF16 8B VL OOMs on 16 GB)
• vae\qwen_image_2.1_vae_bf16.safetensors — from Comfy-Org/Qwen-Image-2.1 (not the old Qwen-Image 1.0 VAE)

Custom node: custom_nodes\ComfyUI-GGUF (UnetLoaderGGUF). Do not install a second GGUF pack.

Setup

powershell -ExecutionPolicy Bypass -File scripts\setup-qwen21.ps1

Restart Comfy only when idle (COMFY_CONTROL_URL/status → gpu.busy=false). Confirm object_info lists UnetLoaderGGUF and the three filenames.

App

• Engine key: qwen21 · UI label: Qwen 2.1
• Generate (T2I) only in this build. Edit / Compose / Iterate / Video disable with: “Qwen 2.1 is T2I in this build”.
• Sampler defaults: euler / simple / cfg 1 / steps 25 · ModelSamplingAuraFlow shift 3.1
• Default canvas 1024×1024 (aspect 16:9 / 9:16 / 1:1 honored, multiples of 32). Drop to 768 if VRAM errors.
• No hero / locks / Klein LoRA stack on this engine.

Graph: server/assets/studio2_qwen21_t2i.json.