Material Recommendations

Best

Soft plastics

HDPE

LDPE

foams.

Dence Polystyrene

Light weight polystyrene

Expanded PVC

Cork.

Noisy

Hard plastics

Acrylic

Wood

Plywood

Pine

Avoid

Solid PVC (Tends to clog bits)

Leather (Fibrous. Cuts but clogs bits. Stinks.)