This is a stepped holder to lift the back of your dish drying rack so the water drains into the sink.
I created this because the sink in the break room where I work has a lip which causes the rack to tip away from the sink and the counter is always wet. This way it drains directly into the sink.
I didn't know how high to lift the rack, so I made it stepped - the steps are at 10mm increments. Happy accident it looks vaguely like a wave.
It's a very rough design, clearly, but it works pretty well. Very well actually.
Added a version 2. It has roundovers on the front and rear edges. I noticed the first one chipped on the back edge, and could pinch a finger on the front edge (comments from people at work). Printed v2 with no supports, curves came out fine.
My printer is the Monoprice variant, and I have the Z-Brace and a glass plate installed.
Clearly you'll want to print it flat side down, so rotate it in your slicer before you begin printing. I designed it from the side on an arbitrary axis, so it's a little funny to look at now.