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I will start by showing the issue so it's super clear what the problem is:

Leaking through

Alright. So the cup has fluid type effector, with Effector type Collision. settings for cup

The cup is parented to the plate so they will act as one. hierarchy

The plate then has a rigid body so it will fall and is also an effector so the liquid should interact with it once it spills over (that was the idea xD). Here are the settings for the plate. settings plate

Then we have the domain which is baked and then the meshes are baked with rather ok settings I guess (I followed a bunch of tutorials and draw some conclusions myself). domain settings

And that's all the info I think should be needed. So, how come the liquid is still just falling down through the cup?

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You are supposed to change your surface thickness. it defines how much of the mesh that will be considered an obstacle. The surface thickness is the same as the value of the volume of your cup. What you do is to multiply the three dimensions of the cup. Whatever value you get is the correct surface thickness of the cup. Hope this helps.

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  • $\begingroup$ So, what you're saying is that "surface thickness" is the unit volume of the effector object ? So if you have a cube as an effector that is 2x2x2, then the surface thickness is 8 ? $\endgroup$
    – angryITguy
    Commented Jun 17, 2020 at 6:06
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    $\begingroup$ I believe there is a bug in the collision calculations, as you'll see in my "answer" in blender.stackexchange.com/a/209934/111042 that Surface Thickness is "in addition" to the mesh volume. ST seems to need at least 0.5 to work as a collision object in blender 2.90, or "Is Planer", neither of which are inadequate solutions. $\endgroup$
    – james_t
    Commented Jan 29, 2021 at 20:08

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