K40 Air Assist Nozzle

This is the air assist nozzle I use with my K40 laser cutter. The design was created in OpenSCAD and I have included the OpenSCAD file that can be modified. The coiled hose and fitting I used are listed below. The fitting that I used to attach the hose to the nozzle came with a barb on the fitting. To use this fitting with the hose I selected the barb needs to be cut off with a utility knife. This is not difficult to do because the fitting is plastic.

I used a 1/8 NPT pipe thread tap (available at a good hardware store.) to create threads in the the plastic for the fitting.

Self-Retracting Polyurethane Tubing
Abrasion Resistant, Opaque Yellow, 5/32" ID, 10 Feet Long
McMaster Part: 9148T122

Super-Flow Barbed Fitting for Food & Beverage
Plastic Adapter, for 5/32" Tube ID x 1/8 NPT Male
McMaster Part: 2808K23

I use an aquarium air pump for my air supply (110 L/min , 1750-GPH)