About this 3D model

Simple design made from scratch to learn Tinkercad. Note the rounded corners! Not as impressive as the hex-hole pattern I did eventually get to work, but that had too many crevices, especially in slightly drooping overhangs. I may end up sanding the inside that sits against the sponge. It's not quite the same on each side – though that might be a future improvement. One side has 2x 90° angles. The other side has 2x 92° angles to better fit our sink, but should be slightly wider still.