I decided to build a 3" quad capable of carrying a Runcam 5 for HD recording, and I ended up with this 350g chonker.

ItÂ´s heavy, but it flies just fine!

Photos

Part List

Frame	Realacc Martian II 140mm Wheelbase 3mm Arm Carbon Fiber FPV Racing Frame Kit (4 builds) Banggood.com	$21.43
Flight Controller	MAMBASYS F405 MK2 Betaflight Flight Controller F40 40A 3-6S DSHOT600 FPV Racing Brushless ESC 30.5x30.5mm (55 builds) Banggood.com	$89.99
ESCs	Diatone Mamba F40 40A 3-6S 30x30 4in1 ESC (38 builds) Racedayquads.com	$38.99
Motors	4 x HGLRC Flame HF1407 3600KV (9 builds) Rotorama.com	$57.08
Propellers	HQ Durable Prop 3X3X3 Light Green (3 builds) Team-blacksheep.com	$2.79
FPV Camera	RunCam Racer Nano (13 builds) Shop.runcam.com	$34.99
FPV Transmitter	TBS Unify Pro32 Nano 5G8 V1.1 500mW Video Transmitter (401 builds) Getfpv.com	See Site
Antenna	Lumenier Micro AXII 5.8GHz U.FL FPV Antenna - Choose Your PolarizationLHCP (59 builds) Racedayquads.com	$19.99
Receiver	TBS Crossfire Nano Rx - FPV LONG RANGE DRONE RECEIVER (1507 builds) Team-blacksheep.com	$24.95
Batteries	Tattu 850mAh 14.8V 75C 4S1P Lipo Battery Pack (XT30) (35 builds) Getfpv.com	$18.86
3D Printed	Martin II 3" GoPro Session Mount by ShatteredDnB Thingiverse.com	See Site
Hardware	Battery Anti-slip Pad (3pcs) Team-blacksheep.com	$5.95
Misc Parts	Runcam 5 Orange - 4K Action Camera (21 builds) Getfpv.com	$109.99