A very quick post about how to cut grungeboard on a Cricut; a) to help me keep a note incase I forget b) incase anyone finds this post via a search for 'how to cut grungeboard on a Cricut'.
I have a basic Cricut Expression and I used the following settings:
depth 6 on the deep cut blade
a new mat
I also found that it cut better with the fluffier side down on the mat, which surprised me but that was my experience.
I have it on good authority that it's best not to use too high a pressure setting when using thicker materials, as it creates too much tension on the material and prevents the Cricut being able to glide it along smoothly whilst cutting. This has been proven twice recently on projects I've completed.
Hope that helps; if not, send me a message and I'll see if I can help.
Take care out there