Creating solid surface?

I have tried at least 15 times to create the solid surface to CNC and failed. The script works fine, I create a block fine but when I try to 'replace face' I get an error message on the second surface selection. Where am I going wrong?

JON-A-TRON2 months ago

My guess is that the body you're trying to use to replace face is larger than the perimeter of the surface you're trying to use as your cutting tool. Make sure your body is slightly smaller than the surface on all sides, and it should work. I talk about this issue in more detail in Lesson 3.