Модели Solidworks

https://grabcad.com/library
и просто ищите в поиске:

http://www.cb-online.ru/
https://www.3dcontentcentral.com/Default.aspx
https://my.solidworks.com/cadmodels
http://chertezh.by/3d/
https://3dlancer.net/ru/3dmodels/solidworks
https://www.2d-3d.ru/3d-galereia/solidworks/

https://www.3dfindit.com/ru/

https://vc.ru/services/65400-sayty-dlya-inzhenerov-i-razrabotchikov-gde-mozhno-besplatno-skachat-3d-modeli