The original design by used Jarom Efler from Thingiverse (thing:2419424) was great. But it only supported 2 boards. I remxed this version that supports 3 cutting boards using Tinkercad.
I suggest PETG with 100% infill for better rigidity. PLA may also work, but I had cracking issues after few months of use (your results may vary).
The author remixed this model.
The original design supported 2 boards. This remix is for 3 boards. There were other remixes for supporting 3 boards for this model at the time. But many of them had geomatry issues and visible seams. Therefore I decided to remix from scratch using the original 2 board version.