How many rounds of samples should I expect before something's actually production-ready?
The short answer
Budget for at least three, a rough first sample to check the concept works, a refined second sample that fixes the obvious misses, and a pre-production (PP) sample that should be near-identical to what ships. If you're still rejecting samples after round four, the problem is usually your spec sheet, not the factory. Pay for every sample; free samples train you to accept mediocre ones.
A quick summary to orient you. The real value is below: the resources worth your time, from people who've actually done it, not us.
Here are the resources
Hand-picked from around the web, each with a note on why it earns your time. India-specific ones carry a badge.
3 resources1 India-specific3 link-checked
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Why we picked it
Makes the direct case for treating the pre-production sample as your last checkpoint before a batch you can't easily undo.
Why we picked it
The clearest explanation of why a physical, signed sample, not a spec sheet, is the real definition of 'correct' once production starts.