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PCBWay does CNC and sheet metal, apparently together
(sh.itjust.works)
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No clue. Maybe they have a ton of one size endmill and that's all that's loaded.... Doesn't really make sense though, would be simple enough to swap the tools in setup.
Only thing that does make sense is they were doing another job with the same material and needed just that finish, or were out of slots in the changer, etc.