How to add grid pattern over a surface?

Hello everybody,
I’m new in Blender and I just make my first toys. It’s designed in Blender and 3D printed. However when I order the 3D print the toy come with very cool grid over the most of the surface. Now i want to recreate this mesh in Blender for future CNC milling of the toy from wood. I have try to cut a plane and with binary modifier to cut it thru the surface ,but the result was very bad. Can someone tell me a better way to do this job? Thanks!