diff --git a/server/operators/trellis_mac/run.py b/server/operators/trellis_mac/run.py
index 1c92c19..bb2b8ba 100644
--- a/server/operators/trellis_mac/run.py
+++ b/server/operators/trellis_mac/run.py
@@ -1,5 +1,6 @@
 import argparse
 import json
+import os
 import subprocess
 import sys
 from pathlib import Path
@@ -34,8 +35,18 @@ cmd = [
 if p.get("no_texture"):
     cmd.append("--no-texture")
 
+env = os.environ.copy()
+# xet chunked downloader fails on these BFL/Meta repos ("Unable to parse string
+# as hex hash value") — force the reliable HTTP path (same fix as flux_local).
+env["HF_HUB_DISABLE_XET"] = "1"
+# guard the torch + compiled-kernel OpenMP collision like sf3d does.
+env["KMP_DUPLICATE_LIB_OK"] = "TRUE"
+env.setdefault("OMP_NUM_THREADS", "1")
+env.setdefault("MKL_NUM_THREADS", "1")
+
 print("+", " ".join(cmd), flush=True)
-res = subprocess.run(cmd, cwd=str(VENDOR), stdout=sys.stdout, stderr=subprocess.STDOUT)
+print("(first run downloads TRELLIS.2-4B + dinov3 + RMBG-2.0 weights)", flush=True)
+res = subprocess.run(cmd, cwd=str(VENDOR), stdout=sys.stdout, stderr=subprocess.STDOUT, env=env)
 if res.returncode != 0:
     sys.exit(res.returncode)