Building currently - check back soon for images and firmware download.

You might want to use an acetone mixed paste to connect the pieces and smooth the transitions. You'll need supports enabled for all of the parts.

I'm using two 1 1/2" diameter motors on the sides, and three 1" diameter motors for the rest; they're all bi-directional with 3 prongs. Recommended propeller size: 5" radius. This is a rather large design, with a wingspan over 1 1/2' without propellers; ~2 1/2' with propellers. The battery pack is 4 1/2" x 5 1/2" x 1 3/4". Designed to house (7) AP13G3N batteries with a total of 4.6 Ah. The BMS, sensors and IC fit under its body (you have 2 1/2" of room on the y axis if you fill the battery pack, 4" if you want to use your own). Design and print a cap to fit your needs. It's a powerhouse designed for lifting ~5-7 lb (possibly more - I'll get the test results to all of you soon).

The copter is designed to allow up to two motors to fail without it crashing; giving time for the firmware to reverse the propeller and unjam it (hopefully). It also can just use the triangular pattern of the three motors if the batteries are running low, or you don't need the speed boost from the larger side motors. The improved grip on the bottom should help with landing on uneven surfaces. The "wings" are designed to be aerodynamic under the predicted forward flight angle.