Does anyone have small (approx 12" x 12" x 0.5") quantities available of some very high density precision HDU foams? Ideally something like General Plastic's FR-4625.

I am trying to machine parts of a model that require very fine detail. I have tried 18lb HDU but its too coarse, also tried Delrin plastic but keep breaking the fine bits since the plastic is too hard.

I am machining pieces using bits as small as 0.03". I get decent results on the delrin but I think since i am using vcarve pro 8.5 instead of more advanced CAM software the 3D finishing tool path occasionally likes to bury the bit aggressively causing them to break.

Thank you.