Walk a Layer Shift Through Five Whys
Use Five Whys to identify a process-level cause of a recurring layer shift and convert it into a PDCA test.
Repeat defect Three long prints show the same Y-axis shift at about hour seven. A rescue reprint may satisfy one order but leave the shop exposed to the same failure. Five Whys to PDCA Symptom -> mechanism -> process control Five Whys keeps the diagnosis moving until the cause is controllable. PDCA turns the fix into a measured test instead of a superstition. Reprint May solve today, learns little The fix becomes a standard, not a lucky setting. Do not stop at the first technical cause. Continue until the cause points to a controllable process. 01 Mechanism 02 Process gap…
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