# Ask Experts

**URL:** https://sierraconnect.protoexpress.com/c/ask-experts/80.md

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## [About the Ask Experts category](https://sierraconnect.protoexpress.com/t/about-the-ask-experts-category/4268)

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**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Replies:** 0

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## [Ask the instructor: Stack-up questions](https://sierraconnect.protoexpress.com/t/ask-the-instructor-stack-up-questions/4481)

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**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Replies:** 1\
**Last updated:** [September 11, 2026, 3:52pm UTC](https://sierraconnect.protoexpress.com/t/ask-the-instructor-stack-up-questions/4481 "2026-09-11T15:52:32Z")

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Got a PCB stack-up question you’ve been meaning to ask? Drop it in below! Layer count, materials, impedance, copper thickness, HDI, signal integrity, or a stack-up you’re currently struggling with… ask away. I’ll show…

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## [Ask Greg: What makes a layout manufacturable?](https://sierraconnect.protoexpress.com/t/ask-greg-what-makes-a-layout-manufacturable/4329)

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**Author:** [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Replies:** 0\
**Last updated:** [August 3, 2026, 4:18pm UTC](https://sierraconnect.protoexpress.com/t/ask-greg-what-makes-a-layout-manufacturable/4329 "2026-08-03T16:18:05Z")

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Lucy: So I I need to ask you something. What makes a layout manufacturable? Following all the right rules. Simple answer. Now what are the right rules? That’s the complex part. Basically it’s following all the righ…