3D Printed FPV Quadcopter The Crossfire
by MikeyB, published
This is my version of a 3D printed quadcopter. I designed it from the ground up for FPV, but it will work equally well as an aerobatic quad. This quad had been under development and testing over the last few months. Thanks to a lot of input from the members of this site I have decided to publish it as a finished thing. That being said I will continue to develop and add components/ modules for this quadcopter in order to make it more customizable. I am also in the process of designing a tricopter and a hexacopter. Many of the components will be interchangeable across my line. Print, fly and enjoy. As always input is always appreciated. Thanks everyone for all the support.
I sourced Most of this stuff from Hobbyking, but try getfpv.com for your electronics. They are a great one stop shop for multirotors and FPV.
Motors - RCTimer 750 Kv
ESCs - Turnigy Plush 30A
Battery - Turnigy Nanotech 3S or 4S 4000mah
Flight Controller - KK 2.0
Update 11/14/13: Just uploaded a video I shot of some BASE jumping. Check it out if you are wondering about a gimbal.
Update 8/14/13: If anyone if looking to use a CCD camera instead of a GoPro check out this thing thingiverse.com/thing:133200
Update 7/30/13: I've edited together a video of the print and some flight with my quadcopter. It's long overdue but hopefully it will inspire some people to give it a shot.
Update 6/30/13: I have deleted the links to HobbyKing.com because their links always seem to change. A quick search for any of the components on HobbyKing or google should return good results. Sorry for the inconvenience.
Update 5/20/13: I have uploaded the .SKP files for the quad. Have fun modding and tweaking!
Update 3/18/13: Added the Bottom Plate for use with the Tube spacers. The only change was a new set of holes on the Bottom plate.
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Hey everybody. As this thing nears 100,000 views and almost 50,000 downloads (WOW!) I was wondering if those of you who have printed and are flying one could do me a favor. I was hoping you guys could send me a PM with your setup (electronics, escs, motors, battery, flight controller, fpv gear and any customizations you are flying with). I am compiling a list of known, working setups that I will post in the instructions along with a link to your make. I think this will help out a lot of people who are just getting started and are not sure what to use. I will be doing a similar list for the C2 thread. Thanks again for all the help.
I've been trying to get my Crossfire off the ground with the MultiWii, too. I'm having a similar problem to the one you describe. I think, but have not confirmed, that a frame flexible mode is coupling back into the rate gyros on the MW board. What I discovered, so far, (and the jury is still out on this), is that smaller props help. I was using those "bendy" 10 x 4.5 electric flight props for initial testing but discovered that the shorter 8 x 4.5 electric flight props are a bit better. Doesn't help endurance much but I think it helps quiet things down a bit. I suspect moving to large, carbon props will chase this problem away. But, I haven't finished all of my initial flight testing yet. Will update this as I go.
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2.) Print the Arms at 50% infill. Depending on material used you may be able to get away with less infil. Using ABS and 50% will give a good starting point for a very strong, light arm.
3.) The arm, leg and pad can just be press fit together. They should fit snugly, some sanding or shaving may be required to get desired fit. Super glue can also be used if parts do not fit snugly. I have printed mine on a replicator and tolerances work well.
4.) Assemble frame and arms using 8-32 nylon machine screws or like.
5.) The bottom plate is designed to accept a 9g servo for articulating the GoPro tilt mount. Us a push rod to connect the servo arm to the hinge arm on the GoPro case.
6.) Using ear plugs or other vibration dampening material in between the GoPro case and the hinge. This will dampen out any vibrations that get to the GoPro and reduce or eliminate the rolling shutter problems that GoPros have with multi-rotors.
7.) Add electronics.
8.) Dynamically balance props on the motors. THIS IS VERY IMPORTANT FOR A STABLE FLYING PLATFORM AND TO ELIMINATE VIBRATIONS.
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