I recently had my Koonie Air duster trigger brake on me and I had a 3D printer so I whipped open inventor Pro and made up a simple replacement trigger which is almost a one to one replica And fits nice and Snug It prints laying down on its bottom and requires just a tiny bit of support material at the bottom after you can use your filament cutters or some sandpaper to sand or remove the rest of the support material to make sure it slides in nicely