Sounds quite logical to me. I don't think there is a proper explanation for this, bacause if someone can do something once, wwhy not more times. But we need some 'reason', otherwise Middle Earth would probably use Rings of Power as commodity...
Perhaps (feeble attempt).... Although Sauron forged the One alone, he was in the presence of many great Elven Smiths. Maybe he was partly inspired by their work and perhaps new ideas these Elves had about forging Rings?
Jellinek
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