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Diametric's Mini Quadcopter

by diametric, published

Diametric's Mini Quadcopter by diametric Mar 19, 2013
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Diametric's Mini Quadcopter by diametric is licensed under the GNU - GPL license.

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A simple printed mini quadcopter frame. It features a press fit battery holder, receiver holder, and electronics IMU shield.

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. =)


Bill of Materials located here:


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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Where are the overall build instructions please?

Very responsive, with a scary amount of thrust. Thanks for sharing Diametric!

I am building mine and when you say to remove the 3-phase wires from the ESC are you recommending that we desolder the wires from the pads and add a bullet connector directly onto the solder pad???

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.

Yes. Well at least that's what we did. We (Midsouth Makers) built 3 of these this week.

Is it power full enough to carry a GoPro ?

I'll post the weight later tonight or tomorrow. I believe it can carry a GoPro, but may not be able to gain a lot of lift or do acrobatics. You can do a lot to shave weight off it, such as printing at 40% infill, forgoing the electronics cover, using glue instead of ty wraps for the ESCs, etc.

Just ordered all the parts! Mine came out to about $140 with shipping. Very excited to build a microquad, I have a 700mm elev-8 right now. Thanks for making it easy to find all the parts and order!

What is the average flight time?

With the battery in the BoM, 10 minutes or more with stable non-aggressive flying. In acro mode with full throttle ranges and doing flips, etc, I get about 6 minutes average.