F450 F550 Quad Hex frame spacers.

thingiverse

Here are some simple frame spacers that you can use on any quad/hex that uses the f450/f550 DJI style arms. I made these for my f450 because I wanted to fit a 5000mah 4s battery between the chassis plates. You will need to source some longer bolts to mount the arms with the spacers. I use 10mm M3 socket head cap screws. Be aware that some frames like the hobbyking ones use M2.5 not M3. The spacers are 5mm deep and you could scale them in the Z if you need different size.