Update (4/15/18): File, "bb004v1.1 plus motor mount lower.stl" added after substantial testing. This is a stronger version of the lower motor mount part. The v1.0 part had a little too much flex.
The Birdbone Plus is a very fast, lightweight, rugged, 3d printable, plus configuration freestyle/race FPV quadcopter frame that can accommodate 4", 5", and 6" props. It uses standard 8mm O.D. carbon tubing for arms. Cut the tubes to length as-needed for your props.
I developed the frame using ABS and SemiFlex. Other materials will likely work very well. Typical weights for a 6" prop configuration are 75 grams for the printed components and tubes, and around 25 grams for all the mounting hardware. Substitute nylon/aluminum/titanium mounting hardware to further reduce weight.
Download the latest instructions .pdf file for build process details.
Arris 8mm O.D. 3K tubing (Amazon ASIN: B00TF8UY9A)
Fine toothed hacksaw blade (and a hacksaw)
(Qty=8) #4 x 3/4" length thread forming screws (McMaster P/N 92295A109)
(Qty=20) M3 x 12mm length screws (McMaster P/N 92095A183)
A 3/32" drill bit specific for drilling carbon fiber (McMaster P/N 2828A71)
(Qty=8) 4 x 3/8" pan head sheet metal screws (McMaster P/N 90190A108)
35mm long standoffs (Amazon ASIN: B071NFCP8W)
(Qty=4) M3 x 8mm (McMaster P/N 92095A181)
OPTIONAL (depends on electronics):
(Qty=4) M3 x 22mm (McMaster P/N 92095A473)