This part totally fit for Gopro action camera, extend the range of view by 100mm, improve your footage & help to create more contents. Recommended infill : 100% in PLA or ABS For the best quality please print with 0.15-0.2mm thickness / layer. You need to add a M5 hexagon nut after finish printing. All my models are exported to high-poly setting. Your satisfaction is my happiness. For more gadgets please direct me : Kaspergadgets@gmail.com Thank you for your support.