This is a replacement for hobbykings Quanum Observer (Volantex Ranger Ex 757-3) battery tray.Tray is large, most printers won't be able to print it on one go, so I have splited it in two parts, which you can later assemble together. Added mounting wholes for M5 screws allowing to move landing gear forward (need to drill out wholes in your LG). I would sugest using large washers to reinforce mount (25mm outside diameter in my case) and using included caps over them so you will still have some nice flat area for batteries. There are also two cable tunnels in this tray. Trying to save on weight of this tray I have added some cutouts for the gear I am intending to use (X8R, pixhawk telemetry module, spare/VTX battery). Versions with and without those cutouts are included. .sldprt files included for mods