Why One Revision Is the Common Baseline
Most manufacturers include one revision round in a standard sample fee, sufficient for correcting minor deviations from a well-defined initial spec.
What Increases the Number of Rounds Needed
Vague initial specs, late-stage feature additions, or first-time buyers still refining their product vision during the sample stage typically require additional rounds — budgeting for 2-3 rounds is more realistic for a genuinely new-to-market product.