Crossfire 2

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The Crossfire 2 Revolutionizes FPV Quadcopter Design. Everything you loved about the original Crossfire is now even better, stronger, and easier to build. After a year of flying in the wild and getting amazing feedback from the community, I'm excited to share this improved design with you. A huge thank you goes out to all who printed, tested, flew, and remixed the original Crossfire. Your enthusiasm and support mean everything, and I'm proud to be part of such an incredible open source community. As always, please print, fly, and enjoy your new Crossfire 2! Feedback, makes, and remixes are always welcome. If you appreciate my designs, a small donation is greatly appreciated, as it helps me continue sharing awesome projects like this one! Check out this video for some motivation: https://vimeo.com/79370836 FPVlab Discussion Thread: http://fpvlab.com/forums/showthread.php?25717-3D-Printed-Crossfire-2&p=433303#post433303 So, what's new with the Crossfire 2? A lot! While it looks like the same old Crossfire, it has undergone significant improvements based on community feedback. -New Arms: The arms and landing gear of the original Crossfire were too weak. I've redesigned them to be stronger and more durable while maintaining a lightweight design. They now feature M3 lock nuts press-fit in, standardizing hardware for the quadcopter and making it easier to attach the arms. This also allows for easy removal of the top or bottom plates, giving access to the center of the frame. -New Frame: The Crossfire 2 has been standardized to use M3 hardware, making it more versatile and adaptable to different flight controllers. You can now mount standard flight controllers like the KK Blackboard or KK2.1 directly to the frame in either a 45-degree or orthogonal orientation. I've also optimized the design for the APM controller by using vibration-dampening bushings. This setup provides excellent vibration dampening without any balancing of the props, and even exceeds the recommended tolerances set by 3DR. -New Top Cover: The top cover has been redesigned to accommodate the APM 2.6's GPS/Compass module. Update (2/23/14): I've uploaded .SKP files for those who want to remix the design. Update (2/13/14): I've added links in the instructions for an explanation on motor KV and a calculator to help run some numbers on motor and prop combinations. Many of you have been asking about this, and it's still a bit of a mystery even after building several multicopters. I hope this helps! Update (2/1/14): I've added battery strap slots to the bottom plate for battery straps. If you're not planning to use a camera or vibration-dampening battery tray, you can now strap your battery directly to the bottom plate. Instructions: See the attached PDF for a build log and instructions. At an infill setting of 10%, the frame weighs around 400 grams with everything, including the arms, hardware, top and bottom plates, top cover, and vibration-dampening bushings. The arms weigh around 38 grams, making them about 12 grams lighter than DJI's arms. The whole frame together weighs around 120 grams more than DJI's Flamewheel, but this doesn't take into account the weight of all your equipment. The one pictured in the image weighs around 1700 grams (GoPro3, gimbal, brushless motors, props, FPV equipment, APM, and a 4000mAh battery). Arms: There are currently two arms available: ArmTall3H - Standard reinforced arm with a tall leg and three-hole mounts for the motor. ArmTall4H - Standard reinforced arm with a tall leg and four-hole (16x19mm) mounts for the motor. For vibration-dampening battery trays, see this thing: http://www.thingiverse.com/thing:239594 Here are some links that explain motor KV and help you choose the right electronics and prop combinations: http://www.flyelectric.com/ans.kv.html http://www.ecalc.ch/xcoptercalc.htm?ecalc&lang=en