

I’d thicken the bottom, and then have the interface have some pegs/holes to fit together like a puzzle. If you’re printing in that orientation the pegs should be unlikely to shear off. Then, lots of super glue and sand it down. As others have said, a lip underneath the interface would give you more surface for super glue as well.
Because it’s going in your fridge, there will be inevitable spills that need cleaning. So I’d want to minimize the seam and complexity on the interior of the container.
Why are they proxying the stream through their server though