These are blade connectors for a Hamilton Beach Electric Knife, model 74250R. I melted the original cutting foam with the knife and these are replacements. I resin printed them but they were too brittle to still cut foam, but maybe you will have better luck FDM printing them or with a more flexible resin, think the originals are nylon. 

Hamilton Beach Electric Knife Blade Connector

Blade Connector Left.step

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Hamilton Beach Electric Knife Blade Connector