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Amazon.com: LASER TREE 7.5W Engraver Module, 450nm Output Blue Light PWM TTL Cutter, Adjustable Focus Laser Module, Compatible with Laser Engraver Machine
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Amazon.com: 15W Laser Head 15000mW 33mm Laser Module for DIY Laser Engraving and Cutting with PWM/TTL D-ZK3 efficient Light Transmittance : Arts, Crafts & Sewing
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Amazon.com: (40) Laser Head, Blue Laser Module, Ultra-Fast Engraving of Stainless Steel and Oxidized Metal, high Transmittance, with PWM TTL
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