Undercabinet Mounted Cutting Board Holder

Mirror the object to "make" the other side of the holder. Drill mounting holes at the interval needed for your setup. The holder depth is about 250mm which should be enough for most boards and be the limit of most 3D printers. 

I printed with 4-5 walls with gyroid infill. 

You can place a modifier volume set to 100% infill on the part in the slicer if you need to reinforce the hole locations. 

I uploaded 1 and 1.5 inch models. I have attached the FreeCAD project that you can modify to change the height and depth of the board.