Microblivion II - Carbon Fiber Frame - HD Runcam Split 3 Nano on 4s

By wrong17 on Sep 30, 2019

6  282  2

Thanks to Dave_C_FPV for the great frame design from Thingiverse (https://www.thingiverse.com/thing:3792194), we liked it so much that we got it custom cut from 3.5mm carbon fiber. It was a tad heavier than we hoped but 12g is not too bad. There are a few important key factors that determine the frame we wanted:

  • 1404 motors (4 bolt pattern and 14XX size motor protection)
  • TinyWhoop AIO boards with bottom facing USB port

After our initial testing with a RotorX 1404 3600kv motor we knew that we wanted to continue using a 1404 size motor, because they are very efficient and powerful. At the total extreme, you can get over 11 minutes of flight time with a 4s 520mah lipo. And if you freestyle you can get at least 4 minutes or more, but it all depends on how you fly.

Since I am planning to use a GEPRC AIO 12a board, I needed a frame that supported a bottom facing USB. Only recently, Nameless RC and BetaFPV came out with a TinyWhoop AIO board with a side USB port. With these new boards, I will not need to worry about finding a frame that works with the GEPRC AIO 12a board.

We start off by 3D printing the Microblivion II frame with various material and we were not too impressed with the strength of the frames in relations to the weight.
Stiffness (Firmest first)

  1. Carbon Fiber PLA
  2. PLA
  3. Carbon Fiber Polycarbonate
  4. PETG

Weight (Lightest first)

  1. Carbon Fiber Polycarbonate @8.70g
  2. PLA @10.75G
  3. Carbon Fiber PLA @11.07g
  4. PETG @ 11.11g

The 3D printed frames are 4mm thick and the custom cut Carbon Fiber frame is only 3.5mm. To our surprise the carbon fiber cut frame weighs the most at 11.72 (it’s actually 12g but it lost a little bit of weight after I sanded the edges). And without a doubt the carbon fiber cut frame is significantly stiffer than any 3D printed frame. For 3D printed frames, being firm does not mean that it will be the most durable. Typical a PETG part would be a lot more durable than PLA. However, to much flex is not good for a quadcopter either. Overtime a 3D printed frame will most likely to fail, especially if you fly it hard and I am not a big fan of constantly rebuilding these tiny quads. So, I rather pay a few extra bucks and get a real carbon fiber frame. However, as Dave_C_FPV mention before the advantages of a 3D printed frame is the cost and its immediately available. Unless you happen to have a CNC machine at home, then that’s a whole different story.

Special thanks to my buddy Erick ( https://rotorbuilds.com/profile/7846/ ) for finishing up my build. Here is what happen during my first go around with this build. I just completed all the settings on betaflight, tested the motors directions, and ETC. I did all the preparations with a 2s lipo and everything worked fine. But when I plugged in a 4s lipo for the maiden flight, it lit up like a light bulb.

Similar to my Flexrc Simple X 120, I was getting mid throttle oscillation. The strange thing about it is that it does not always happen. I made a few changes on Betaflight and the oscillation went away.
My current PIDs settings with Betaflight 4.0.2 are (mostly stock settings):
Alt Tag

More info soon..... in the mean time here is the maiden flight video:

Runcam Split 3 Nano:

DVR

Photos

Part List

Frame

The Microblivion II by Dave_C_FPV (6 builds)
Thingiverse.com
See Site

Flight Controller

GEP-12A-F4 Flight Controller 12A ESC - GEPRC (24 builds)
Geprc.com
$42.99

Motors

4 x AirBlade Superman AB 1404 Brushless Motors (43 builds)
Airbladeuav.com
$51.96

Propellers

HQProp T3X3X3 PC Propeller (Set of 4) (34 builds)
Airbladeuav.com
$2.18

FPV Camera

RunCam Split 3 Series (86 builds)
Shop.runcam.com
$69.99

FPV Transmitter

TBS UNIFY PRO32 NANO 5G8 (214 builds)
Pyrodrone.com
$29.95

Receiver

Team BlackSheep TBS Crossfire Nano RX - Heli-Nation (665 builds)
Heli-nation.com
$24.99

Batteries

GNB 4S 520mah HV 80C XT30 Lipo Battery (12 builds)
Pyrodrone.com
$12.99

Radio

Team BlackSheep TBS TANGO 2 PRO RC RADIO (15 builds)
Heli-nation.com
$199.99

Goggles

DJI Digital HD FPV Goggles (76 builds)
Getfpv.com
$529.00

HD Camera

GoPro HERO7 Black Action Camera (74 builds)
Getfpv.com
$399.99

HD Camera

GoPro HERO8 Black - Waterproof Action Camera with Touch Screen 4K Ultra HD Video 12MP Photos 1080p Live Streaming Stabilization (8 builds)
Amazon.com
$269.95

HD Camera

Insta360 GO Stabilized Sports Action Camera Mount Anywhere Hands Free Auto Edit Water Resistant Slow-mo Vlog Travel 1080P Video (2 builds)
Amazon.com
$169.99

Misc Parts

Toothpick Nano Pod Lite [14mm] by Dave_C_FPV (5 builds)
Thingiverse.com
See Site

Misc Parts

Toothpick Style Quad HD 20x20 Adapter Caddx Turtle Tarsier or Runcam Split by wrong17 (3 builds)
Thingiverse.com
See Site

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (144 builds)
Getfpv.com
$149.99

Battery Charger

HOTA D6 PRO Charger AC200W DC650W 15A (6 builds)
Pyrodrone.com
$119.00

Soldering Iron

TS100 Portable Programmable Smart Soldering Iron (162 builds)
Racedayquads.com
$51.29

Backpack

Lowepro QuadGuard BP X3 - Drone Backpack for 4 FPV Quad Racing Drones and 15" Laptop w/Exterior Mounts (Black)
Amazon.com
$286.00

Accessories

BoYz analog bay v2 for DJI FPV goggles
Themakerboyz.com
$23.98

Accessories

Analog FPV FatShark Module Adapter V2 for DJI Digital FPV Goggles
Pyrodrone.com
$11.99

Accessories

FuriousFPV Smart Power Case V2
Helidirect.com
See Site
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Discussion

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Dave_C FPV   Oct 01, 2019  
1

Great build and really insigtful post! Fully share your view that carbon fiber is the superior frame material in terms of performance and durability (no big surprise). The advatages of 3D prining it are more about being cheap and always immediately availabe

wrong17   Oct 01, 2019 

Once again thanks for all the great designs you have share on thingiverse! You are right and I just lost sight of the main purpose of a 3D printed frame. I think my lack of free time to working on my hobby has played a role on my main focus of maximum durability.

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