I remixed deLamorDesign's espresso knock box to change the dowel diameter from 0.75 inches to 20mm, and increased the box diameter from 100mm to 120mm.

When slicing this I added a modifier region to set the infill percentage to 50% near the dowel holes in order to strengthen this area. The rest of the object was printed at 0.2mm layer height, with 10% rectilinear infill, using Prusament Galaxy Silver PLA.

I printed 4 feet using silver Flexfill 98A TPU filament (0.2mm layer height, 3 tops, 3 bottoms, infill 15% gyroid) and stuck them onto the base using superglue. These feet lift the knockbox off the benchtop so it doesn't get wet if water is spilled nearby.

The dowel can be sealed with any sort of wood coating, I used "board butter" (a mixture of beeswax and coconut oil) since that's what I had on hand. Sealing the dowel is important because it prevents it from absorbing moisture and swelling up.

I've filled up and emptied the whole container about 4 times now, and it's still working great, no cracking or other damage.

I've also included the Fusion 360 project file so you can tweak the design yourself (e.g. you can change the dowel diameter in the Change Parameters menu), and pre-configured 3mf plates for use in PrusaSlicer.