Metals
. Aluminium
. Copper
. Gold
. Iron
. Lead
. Magnesium
. Silver
. Steel
. Titanium
. Zinc

Plastics & Composites
. ABS
. Acrylic
. Kevlar
. Nylon
. Polycarbonate
. Polyethelene
. Polypropylene
. Polystyrene

Woods
. Hardwood
. MDF
. Softwood