import os 
os.environ["HF_HOME"] = "/tmp/hf_cache"

from diffusers import StableDiffusionLDM3DPipeline

pipe_ldm3d = StableDiffusionLDM3DPipeline.from_pretrained("Intel/ldm3d")

prompt = "A picture of a castle in the mountains"

output = pipe_ldm3d(prompt)
obj_file = output.obj
obj_file[0].save("castle_ldm3d.obj")