90mm printed quadcopter frame for br1103 motors

prusaprinters

<p>I got bit by the nano/piko/femto quad bug and had to make one. I liked the look of @microdure's frame, but it was bigger than I wanted. I had already started working up a very minimal frame design and printed it as 80/90/100 mm....but didn't notice the motor shaft on the BR1103 motors extended through the base. Since I had to redraw my motor mounts anyway I decided to try and design a frame more like microdure's only in the 80-100mm range since a bit of motor protection would be nice to have knowing how often I crash things.</p> <p>Frame is an easy print, that takes just under an hour on my printer at 0.25mm layer height. I also included some small m3 spacers that make it possible to use the TX-02 camera mount I included as a source.</p> <p>You will need to have o-rings under your FC for clearance - or you could mount it upside down or remove the DSM port. I used O-rings. The FC mounting holes are slightly undersized from M3 since I used an M3 tap to thread them then mounted the FC with nylon screws. You could drill them out and use nuts on the bottom if you don't have a tap.</p> <p>With a 450mah 2s battery, LemonRX DSM sat RX, and TX-02 FPV cam/VTX this comes in right at 80g ready to fly when printed in PLA with 15% infill</p> <h3>Print instructions</h3><h3>Category: R/C Vehicles Print Settings</h3> <p><strong>Printer Brand:</strong> Prusa</p> <p><strong>Printer:</strong> <a href="http://amzn.to/2rqZ6Uo">Prusa Clone</a></p> <p><strong>Rafts:</strong> No</p> <p><strong>Supports:</strong> No</p> <p><strong>Resolution:</strong> 0.25</p> <p><strong>Infill:</strong> 15%</p> <p><strong>Notes:</strong></p> <p>So far this has held up better than I anticipated printed in PLA with 3 perimeters and 15% infill. I've crashed it full throttle into my house and sidewalk several times and the frame hasn't broken yet. I may try printing it in ABS since it should be lighter and a bit tougher...but PLA has worked great so far in a few days of crash testing.</p> <h3> Post-Printing</h3> <p>As noted in the description you'll probably want to use an M3 tap to thread the mounting posts.</p> <p>I also drilled out the motor mounting holes - they're sized properly in the STL but 1st layer squish tends to block them up a bit. A #52 or #53 drill bit works great. The motor shafts cleared the center holes fine but I cleaned them up with a #57 drill just to be safe.</p> <p>I used a LemonRX DSM satellite RX which I removed the connector from so it would fit easier inside the frame under the FC.</p> <h3> How I Designed This</h3> <p>This was designed in Onshape and the design is available here:</p> <p><a href="https://cad.onshape.com/documents/0ff58260891f62cc5d956c69/w/6c0088ba3a61f0eb9aca2b9d/e/6b1820b07c502b2d5d3d3fe6">https://cad.onshape.com/documents/0ff58260891f62cc5d956c69/w/6c0088ba3a61f0eb9aca2b9d/e/6b1820b07c502b2d5d3d3fe6</a></p> <p>I used the STL of microdure's frame to transfer the motor mount dimensions, ID of the motor shrouds, and FC footprint.</p> <p>The design can easily be adjusted for different motor to motor sizes. My first build was 100mm motor to motor and flew well, but I wanted to shrink it a bit smaller so I resized it to 90mm which is as small as I could go and still fit 2030 props comfortably.</p>