(K40) Lasercutter - Focus Finder Tool 45°

Focus-Finder-Tool for Lasercutters
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Tool / Holder to add thick papers (100g/m²) for finding the focus point of your laser. Designed with an angle of 45° to measure or calculate your focus distance easily. Connect the two parts with 4mm rods (e.g. carbon or brass).

See last picture for the mathematical formula!