/diy/ - Do It Yourself

>>1182402
My friend that taught me this, uses a really fancy jig system he made that has a router guide. He uses said router to cut the foam VERY fast... I do not have this jig.

This is going to be misery, it will take forever, but use sandpaper. I used 80 grit to get close and finished with 120 later. Wrap it around a dowel and keep going until both ends of the dowel are sitting on their respective sides of the jig. Make sure they stay perpendicular to the work or they may cut off a bit too much.