This is my 3" SQRT (square) Toothpick project that I drew from scratch. All the parts are free to download on the links bellow.

It's running Betaflight 4.1.1 with JESC 48khz on ESC's. You can download my tunning on: https://drive.google.com/open?id=1fqjmpwt5WQsccKe-wTpyt_RhCv6aAz9e

It flies with 3S or 4S LiHV Lipos. The Dump included a tunning for each battery.

You can see it flying at:

If you liked this, please consider to buy me a coffee at https://www.buymeacoffee.com/rodrigosclosa

Photos

Part List

Frame	Apus 3" SQRT Toothpick Frame Cults3d.com	See Site
Flight Controller	NameLessRC AIO412T F411 Flight Controller MPU6000 2-4S HV 5V/2.5A BEC (5 builds) Banggood.com	$45.31
Motors	4 x EMAX 1306 RS1306 Version 2 RS1306B 2700KV 4000KV Brushless Motor 3-4S For RC Drone Multi Rotor (16 builds) Banggood.com	$47.56
Propellers	6 Pairs Emax AVAN Mini 3 Inch 3X2.4X3 3-blade RC Drone FPV Racing Propeller CW CCW (65 builds) Banggood.com	$6.74
FPV Camera	Foxeer Predator Nano V4 1000TVL 16:9/4:3 NTSC/PAL CMOS FPV Camera w/ OSD - Choose Connector & ColorFluorescent Green / Pads / 1. (19 builds) Racedayquads.com	$36.90
FPV Transmitter	Happymodel Diamond 5.8Ghz 40CH 25/100/200mW Switchable VTX FPV Transmitter with DVR Smartaudio Ready 3.3-5.5V (19 builds) Taco-rc.com	$14.99
Antenna	2pcs HGLRC 6.5cm 65mm 5.8G 2dBi U.FL IPEX IPX Omni Directional Linear Brass FPV Antenna RG178 For RC Drone (9 builds) Banggood.com	$2.61
Batteries	GNB 450mAh 3S 80C LiHV Battery (XT30) (11 builds) Hobbyrc.co.uk	$9.85
Batteries	Gaoneng GNB 15.2V 450mAh 80C 4S HV 4.35V Lipo Battery XT30 Plug for FPV Racing Drone (5 builds) Banggood.com	$14.99
3D Printed	Apus 3" SQRT Toothpick - 3D Printed Parts Cults3d.com	See Site