Frame for UDI U816 Quadcopter
by CarryTheWhat, published
This is an add-on to the greatest helicopter toy I've ever played with: the UDI U816.
You can buy the copter on Amazon prime for $60:
Or if you buy more direct ~$40: http://www.banggood.com/Wholesale-Udi-U816-2_4g-4ch-4-axis-Mini-Rc-Remote-Control-Ufo-360-Eversion-Helicopter-p-48619.html
And to support the development of new designs, I have started selling the completed thing on etsy and Tindie:
It comes with a 2.4ghz radio transmitter, and a decent one at that. 2 batteries, extra blades... but a flimsy plastic circuit cover.
The quadcopter itself is about 30g, and about 7 inches from tip to tip.
The printed frame in it's current form is about 15g -- the quadcopter has plenty of surplus thrust to carry it. The extra inertia is actually pretty useful for keeping control.
I was unable, however, to successfully print any of the blades that have been uploaded...
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Print the full frame, if your build space is large enough.
Neither of my printers could fit, so I split it into quadrants.
Print 4 of the quadrants separately, no raft or support necessary.
Then flip them upside down and align the four quadrants together. Add acetone along the edges that come together. I used a pipet to dispense.
To attach to your helicopter, remove the original plastic UFO decal. There are 4 slots in the frame which will fit snuggly over the crossbars extending out to the motors.
You will probably have to re-trim (for some reason, especially about the yaw) because of minor changes to the balance.