I used a 3/8" straight cut router bit with 1/4" shank for roughing out the long MDF pair of bump stops, and a straight cut 1/8" bit for the finish pass.
For the shorter pine bump stops, I used a 1/8" down spiral, fishtail bit for the entire carve.
The short video pretty much shows the process. More info in the video description below the video on YouTube.
You’ll find a link in the video description below the video on YouTube that will lead you to a free plans download page. I drew plans for the short pine bump stops so they can be made with conventional tools (sometimes it’s faster than making them with X-Carve).