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Short nozzle for Omtech K40+ CO2 laser
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Extra short lens mount for Omtech K40+ CNC laser cutters.
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- Printables
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- Mechanical Parts
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- Creative Commons — Attribution — Share Alike
Additionally required parts:
- 12 mm AR coated ZnSe lens (focal length min. 30 mm, max. 100 mm)
- Metal washer (OD 16 mm, ID roughly 9 mm) and superglue OR sticky aluminium tape
Description:
This is a two piece printable focus lens mount specifically tested for Omtech K40+ CNC CO2-lasers. Apart from serving as a simple replacement for the original nozzle, it features a few improvements:
- The actual lens is mounted further up, and the part of the nozzle that sticks out of the mount is shorter, allowing for both the use of shorter focal length lenses and taller materials to be cut/engraved.
- The air assist channel is split, with roughly 20% of the air flow being directed above the lens to reduce the amount of debris and dust that collects in the top side of the lens. This increases the lifetime and reduces the need for maintenance.
- The lens is held in place by a friction fit spring, reducing wear from abrasion.
Assembly:
- Print both parts (I recommend PETG or ABS/ASA, PLA may become malleable). Both parts should be printed upright so the friction fit works best.
- Attach the metal washer to the wide part of the spring piece so the outer edges are flush. Alternatively cover the top surface with metal tape. This serves to reflect any light that hits the sides if the laser is not properly aligned, which would otherwise damage the spring.
- Insert the ZnSe lens into the nozzle from the top. Make sure that the correct side is facing downwards, as these lenses are usually NOT ambidirectional.
- Insert the spring piece by gently pushing it into the nozzle from the top until it touches the lens. Ideally make sure to align one of the slots in the spring piece with the air duct in the nozzle.
- Attach the air assist tube to the air duct and zip-tie the indicating laser (if rpesent) out of the way.
- Install the nozzle in the same way as the original nozzle is installed.
The distance between the lens and the tip of the nozzle is 28 mm, so the focal point will be 28 mm less than the focal length of your lens below the tip of the nozzle.