This depends entirely on your specific laser head model. Most K40 desktop lasers use a 12mm lens, while mid-range and high-power OMTech machines typically use 18mm or 20mm optics. Before ordering, we recommend measuring your current lens with a caliper or checking your machine’s manual to ensure a perfect fit in the lens tube.

Molybdenum mirrors are industrial workhorses known for their extreme durability. Unlike coated glass or silicon, Mo mirrors are solid metal, making them virtually indestructible during cleaning and highly resistant to heat. While Silicon mirrors offer slightly higher reflectivity (about 1–2% more), Molybdenum is the "lifetime" choice for high-wattage machines and environments where frequent cleaning is required.

Often, yes. If your mirrors are misaligned or your lens is dirty/pitted, the laser beam will scatter, losing its focus and intensity. Before replacing your laser tube, check your optics for "burn spots" or cloudiness. A fresh set of clean, precisely aligned mirrors can often restore your machine to its original "factory-sharp" cutting ability.

Inspect your mirrors and lenses under a bright light. If you see pitting (tiny holes in the surface), scratches, or discoloration that won't come off with alcohol, the optic is damaged. Using a damaged lens can cause the beam to reflect back into the laser head, potentially causing expensive damage to your machine.

Materials: Wood, glass, metal, acrylic, leather, plastic, stone, and more.

For standard plano-convex lenses, the curved (convex) side should face up (toward the laser beam), and the flat side should face down (toward your material). Installing the lens upside down will significantly weaken the beam and increase the spot size, making it difficult to cut.

Yes. Even a microscopic shift in mirror position can throw your beam off-center by the time it reaches the third mirror. We always recommend performing a "pulse test" on thermal paper or masking tape after replacing any mirror to ensure your alignment remains pinpoint accurate.