>>289589764
>>289589992
You can also just add the MMDモデル配布あり tag to the search which shows distributed MMD models. For example the Frame Arms Girl tag plus that:
https://seiga.nicovideo.jp/search/%E3%83%95%E3%83%AC%E3%83%BC%E3%83%A0%E3%82%A2%E3%83%BC%E3%83%A0%E3%82%BA%E3%83%BB%E3%82%AC%E3%83%BC%E3%83%AB%20MMD%E3%83%A2%E3%83%87%E3%83%AB%E9%85%8D%E5%B8%83%E3%81%82%E3%82%8A?target=illust