Hi, I can't find reason why the FLIP can't collide with RBD cup. Need help! thanks!

Your Cup is so thin , So you should be sure your volume collision generated correctly at the AutoDopNetwork.

To do that just dive inside AutoDopNetwork and select your Static Object (cup) ,Then In the Collision parameters ,in the RBD Solver go to Volume Tab and to check your Volume Collision shape just turn on “Show Collision Guide Geometry” checkbox ,if you don't have any collision geometry or it's not good , you should increase “Uniform Divisions” and change Volume parameters.

I changed this parameters for solving your problem on the attached file , Please check it :wink:

I Understand, thank you very much!