This little guy is my attempt to create the definitive tiny whoop killer and simply best 8.5mm quad out there. I've gone through dozens of alternative frames. This is the culmination of what I have learned.

• It's the smallest effective (max thrust surface, least arm lenth) frame size (85mm) for a 8.5mm Motor and Micro Scisky / Quanum Pico / FRF3_EVO Brushed FC combo
• Battery mounted in the middle creates amazing balance (close to ideal CG)
• Battery push-fit gets rid of added weight for rubber or velcro
• Very light frame parts using nylon standoffs and screws for stability
• Frame is designed to flex under stress, making the quad very crash-resistant.
• Uses fx798t cam + vtx combo to further reduce weight
• Uses Turnigy nano-tech 500mah for ideal weight power ratio
• FX798T comes with 40ch so you can race with your buddies
• The FCs works brilliantly with betaflight 3.0 so you can enjoy the latest in fpv fw tech
• Will rip.

List of components:

• FC: Micro Scisky / Quanum Pico
  http://www.hobbyking.com/hobbyking/store/__86503__Quanum_Pico_32bit_Brushed_Flight_Control_Board.html

or

• FC: FRF3_EVO Brushed
  http://www.banggood.com/de/Eachine-FRF3_EVO-Brushed-Flight-Control-Board-Built-in-FRSKY-Compatible-SBUS-8CH-Receiver-p-1091779.html

• Cam + VTX: FX FX798T 5.8G 25mW 40CH
  http://www.banggood.com/FX-FX798T-5_8G-25mW-40CH-Mini-Transmitter-Camera-Combo-For-FPV-Multicopter-p-1053038.html

• Nylon Spacer: 5.6mm x 12mm M3 Nylon Tapped Spacer
  http://www.hobbyking.com/hobbyking/store/__29541__5_6mm_x_12mm_M3_Nylon_Tapped_Spacer_10pc_.html

• Nylon screws (cut to length): Nylon Screw Phillips Head M3x8mm
  http://www.hobbyking.com/hobbyking/store/__17847__Nylon_Screw_Phillips_Head_M3x8mm_10pcs_.html

• Batteries: Turnigy nano-tech 500mAh 1S 25~50C Lipo Pack (Losi Mini Compatible)
  http://www.hobbyking.com/hobbyking/store/__88962__Turnigy_nano_tech_500mAh_1S_25_50C_Lipo_Pack_Losi_Mini_Compatible_.html

• Motors: CL-0820-17 "Dark Edition" for insane punch-out
  https://micro-motor-warehouse.com/collections/all-motors/products/cl-0820-17

Print in PLA, ABS (dont forget to scale up a bit to make up for ABS shrinking) or Nylon.

For a slightly bigger but very similar frame, check out frizzy3d's awesome 95 sized version here:
http://www.thingiverse.com/thing:1786378