Improper sub gate or cashew gate design can contribute to flow lines or defects with a splay-like appearance; this is due to plastic faking from the gates as they separate from the part. If this is the suspected root cause you may be able to detect fakes of plastic on the mold near the gate. A useful trick to help diagnose this problem is to manually blow air through the gate between cycles. See Chapter 4 on gate and runner design.