Using unsuitable materials in laser engraving can lead to fires or harmful fumes. Hexavalent chromium-treated leather releases toxic fumes, while carbon fiber and PVC can ignite easily. Safety is paramount; always consult material specifications to avoid hazards. Besides fire risks, some materials leave residues that damage the engraver lens or mirror. PVC, often found in everyday items, releases hydrochloric acid when cut, which corrodes machine components. For environmental and equipment safety, adhering to recommended material guidelines is essential.