Diametric's Mini Quadcopter
by diametric, published
I brought this with me to the Midwest RepRap Festival in March 2013 and several people asked for me to put it on Thingiverse, so here it is!
Video of me flying it:
This little guy has a lot of power. Also, Josef Prusa has personally flown one without crashing it. =)
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It's optional but recommended. It cuts down on the wire footprint. There's very little room on each arm to attach the ESC. The three wires from the ESC that go to the motor are very easily removed. Just cut off the heat shrink onj the ESC. The connectors have large pads they're attached too (As they're high current), and make a good place for the 2mm bullet connectors to attach to. The bullet connectors that come with the motors listed in the BoM also have a small notch in the area you solder to, making it a great place to solder to the ESC pads. Additionally to bolster the stability of the connectors, I run a bit of hotglue in-between and around them at the base of the connectors before I slip some large heat shrink over the entirety of the ESC.
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I neglected to include a few simple things in the BoM, such as tie wraps and jumper wires for the electronics. The motors and electronic speed controllers (ESCs) also require soldering. They come with pre-tinned bare wires. I recommend removing the 3 phase motor wires from the ESC and soldering bullet connectors onto the connectors, reinforcing them with hot glue and covering it in a large piece of heat shrink.
One thing to note, the flight controller/IMU board you affix to this should not be bolted down to the base. The holes on the base are for bolting the battery holder, not the flight controller. You should affix the flight controller with strong double sided tape, possibly sandwiched around a piece of sorbothane if you have vibration issues. You want to minimize the amount of contact to the IMU as possible to reduce noise issues from the motor vibrations. Properly balancing your props will also help with this.
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