Summary

For different board thicknesses, with a depth of 110mm fitting perfectly behind the sink. The holder is designed to make it easy to insert the boards. All boards are slightly angled in the holder and water can runn off below.

Redesign, based on https://www.printables.com/model/196651-cutting-board-holder
Different dimensions and board thicknesses. More room for air to enter, ensuring the boards can dry quickly.