@sad_electronics I've used a bunch of non-chamfered boards for edge connectors, and I think it's fine for a few insertions. The specs on these connectors are often rather loose anyway. I've once managed to stuff a 1.2mm PCB into a nominally 1.0mm SFP+ socket.
@sad_electronics I don't have any experience with M.2 specifically, but for PCIe 4x it was trivial to insert into the slot because the slot has a chamfered lead-in anyway, and with DDR3 DIMM it was a little trickier than normal but worked fine. based on how M.2 works mechanically I think it would be ok? the contacts themselves should center the board pretty well.
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