This video looks at a couple of approaches to making crown molding-styles frames in Tinkercad.
Here's my article explaining ideas for creating projects around frames:
https://blog.tinkercad.com/robs-tinkercad-classroom-i-was-framed
Here's a guide for viewing frames and recording video with Tinkercad's free iPad app:
https://www.youtube.com/watch?v=8xgbimBhjMc
