Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

r.250 FPV Quad

by quadmodder, published

r.250 FPV Quad by quadmodder Dec 5, 2014
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This is a copy of the r.250 I adapted to 3d printing. The original drawing was made by untestedprototype. You can learn more about it at http://untestedprototype.com/2014/07/r-250-fpv-quad-plans/ . I'm currently in the process of printing the frame. I'll post a BOM as soon as I work one up. I'd love some real comments on FC's for this thing. I'm leaning toward multiwii, but I'm open to suggestions. The original plan was to make a mini that would hold a full apm setup, and this one will, but I've lost interest in APM since it pretty much sucks to tune. Pics and BOM will be here soon. There are people waiting for this, so I figured I'd get the STL's up now. Enjoy!


Come join the untested prototype owners group! Show off your printed quads. https://www.facebook.com/groups/374741906069915/

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The screw will not collapse teeth??

Does anyone know what is the height of that spacer?

35mm, but with today's gear, you could get away with 20-25.

do you have a file for the landing skids shown in your picture?

Sorry for the delay, I might, but they weren't for this frame. At the time I threw them on there for the pic. I'll see if I can find them, and post the source so you can edit them if you want.

nice work mate, do you have STP file or solidworks file by any chance ? thanks

thanks. added the source files.

what arms make it a 250mm quad the long or short?? thanks

Short. Long makes it closer to 300.

Maybe a 330 would be a nice addition - Im trying to find a H style quad frame for the 8" props.

To all of you who have built one of these, please take the time to join our new facebook group. The Untested Prototype Owners Group can be found here: https://www.facebook.com/groups/374741906069915/



You should thing again about apm. They have a new auto tune that works very well compared to the before. 3.2.1 firmware is great. I went back after not liking my Naza m lite. I wish I never bought the Naza m lite and would have found the newer firmware for the APM.

I've been having a lot of luck with the new firmware too on my bigger copters. I just literally had a pixhawk land in front of me on the freeway. I may put it in my mini. It was free, why not. I do love the new apm firmware, and you're right, autotune has come a long way. I fully understand not liking the naza. I sold the last one I'll ever own on rcgroups.com a couple of weeks ago. I wont miss it.

3 things.

  1. Make the arm a little wider in the motor mount area to arm transition. The current design is weak there.
  2. Add arms with a 10 degree angle forward on the motor mount (This would require 4 unique arms)
  3. Look into CC3D controller for a low budget controller. Software is excellent and it is well supported. Look into Naze32 board for upper level board.

Thanks for the input. I didn't design this copter, I just converted it for the original designer. If you're noticing weakness in the arms, you may want to check your print settings though. I have a few of this quad floating around. They're all way over powered and running 6 inch props. They have all been crashed, a lot. I have yet to break an arm. If you want stronger arms, look at nerdcopter. I designed that, for abuse, and versatility where fc's are concerned. I fly CC3d on two of my copters now, and naze on another. I have one APM that struggles with minis. I hope nerdcopter helps that. I just sold the last NAZA I'll ever own. I was more looking for people to share settings, than advice, but I do appreciate your opinion, and I dont disagree. I find the CC3d to be a little higher end, but we're splittin hairs with that one. I prefer naze with cleanflight if I have to fly it. I've thought about making 10 degree arms for this, but I contributed the copter, and I've moved on to work on nerdcopter to try to deal with issues I've seen with many copters. Thanks again for taking the time to give input.

I am in the process of printing one of these's quads out. looks amazing so for. ABS 80% infill on frame & arms, Ill post sum photo's when complete, do you have the the file for the landing gear.


Sorry been out of commission for a week or two. I'll draw some landing gear for this some time this week. I use some smaller landing gear that I drew specifically for ninjaflex. They fit on anything.

Congratulations on a job well done on this quad... take my hat off to you... very happy with the quad. fly's very well and with it being so light, it is unbelievably fast... I 'am certainly looking forward to you next quad... just as a inspiration maybe sum LED bumpers... Cleanflight have dun a lot with there software for LED to be mount to the quad for orientation, so integrating that idea would be fantastic..


Funny you should say that. The new frame is setup for use with naze/cleanflight, and accommodates led's all the way around.

Cant wait to print it out... by the way hows the weather in florida. looking forward to my holiday there in May,, if your even in the the. North East of the UK, Newcastle.. knock on the door... A cup of coffee and a place to stay..


It's going to be 5 degrees C tomorrow morning. It must be winter week. It wont last. I've been wanting to get out to te UK for a while. Might have to make it a copter trip...

my best mini quad regarding agility and flying capabilities. Very agile and easy to fly .
-Naze32 with cleanflight
-Dys 1806 motors
-afro12 A Esc
-700TVL cam with IR Cut
-Skyzone 500mw VTX
-loc8tor tag for lost and found
All print in PLA with 40 % infill for the frame and 80% for the arms.

Many Thanks for sharing mate

Thanks for the kind words and specs. I'm drawing a ground up brand new quad now. should fit the same gear in a neater package. Keep an eye out.

A video from last week end with your bird . sorry for the quality


That just made my day. Nice flying!

Looks like everything printed good. Thanks to Eamonn at 305drones.com for the teeny damper bushings. The Mobius mount is a good fit. I would use my mount on a cnc version, since the flange on the bushing is recessed. Anyway, have fun.

I'm currently building the CNC milled version of the r.250. For the FC i recommend the Naze32. It's a great flying board for mini sized copters.

CC3D Openpilot worse? ,)

CC3D works great, but I didnt know how to tune it right, so I had throttle problems. I fixed that yesterday, and now it seems like a good choice. I have a naza, apm, multiwii, and cc3d. They all have good and bad points. I was hoping to get fresh perspective, since all that I read in forums is old.


Thanks for that! Do you mind sharing some settings when you get it tuned up?

Sure! When it flies, i'll post some specs / settings.