Making large models watertight

Hi @Christina98,
I developed an extension that have the ambition to solve similar issues, so your problem is very relevant to me (see the forum thread here).

The option called Voxel Shell creates a watertight shell of your model, but you may lose some details on the way. It is controllable by a resolution parameter.

Would you mind giving it a try? I would be very keen to learn more about the simulation processes that you are running and the sort of constraints that you have.