123D Model Download Guide
To backup models prior to 123Dapp.com closing you will need to log in to the site (www.123Dapp.com) with your account.
Once logged in, models can be accessed by selecting the Models page from the Profile Menu in the upper right corner of the screen.
On the models page you will see all models from your 123D apps available for download.
To download the models for a specific design, navigate to the design and click on its image to see the details of the model.
In the example shown below, I have clicked on a 123D Catch model of my daughters stuffed animal Bugsy.
In the upper right of the details page is the download button. Use this button to download your models.