Just installed my second E3D Hemera, they use similar square nuts. I dropped a few and can't find them. My only alternative was to order from E3D in England and wait. I found them and took a chance as they are slightly thicker at 2mm vs 1.8mm they worked just as well as the original and received them in one day. They should work in other applications where you need a square nut with a 3mm thread.
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