I have started experimenting with this Ethernet adapter, (i took the PCB out of it)
https://www.amazon.com/Poyiccot-Ethernet-Thunderbolt-Internet-Smartphone/dp/B08Y6J2124/ref=sr_1_57
Unfortunately my skills with 3d CAD isn’t the best, but this looks like it will/could work.
The slightly increased size on the bottom is similar to the feet distance., I would plan on a rounded side and that isn’t much that is sticking out on the side. just need the clip/top piece designed on the side.
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So far i have only taken the standard module Framework has released and made it little deeper and longer.
ExpansionCard.stl (54.4 KB)
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That’s a long circuit board ??