Some guy in the desert
3D printing is making these micros so accessible. Theshortcrayon on thingiverse has 2 designs, the swirlie and the doubler, of which I plan on building one soon.
There are a number of other designs up on thingiverse for 80-90mm frames as well.
I've been teaching myself onshape and fusion360 so decided to sketch up a quick and dirty 80mm frame last night. Just a simple X 2mm tall with 8mm wide arms and 15mm motor pads (the 1103 motors are 13.6mm so 15mm gives a little tiny bit of almost protection.) The design is pretty crummy - I did a number of things foolishly in the sketch. But I printed it out over lunch just to get a feel for the size of these things in practice.
We need a jawdrop smilie on this forum...I mean. I've seen photos of these things and have a fairly good feel for measurements (way back in high school I was on our science olympiad team and earned medals two years in a row for metric estimation at the state level) but it still blew my mind just how small this actually is. I had to get out my calipers and measure it to make sure it's really the size I designed it at.
It's not stiff enough that I'd actually try to fly it. I plan to draw the arms as U's or add some ribs to stiffen it up. But just for kicks I taped a dime to each arm, and two nickels in the middle to simulate the weight of flight gear (dimes are a bit lighter than the actual motors but the 2 nickels were a bit heavier than the ESC's and FC so it kind of evens out.) Then I tossed it at the concrete as hard as I could. Tape gave out and the coins went flying after a few tosses - but no damage to the frame.
So it seems 3d printed frame is actually pretty viable for something this small. I didn't account for the weight of the battery or camera...but this is also PLA and I plan on printing it in PETG or Nylon (or annealed Raptor PLA.) so it's a VERY unscientific test that should be taken with a HUGE grain of salt.
My motors and esc's should be here Friday - so need to get going on a real frame! But my props still haven't hit the US (shipped the same day - go figure) so not a huge rush yet. Starting to get excited though. And holding something physical in my hand really made me realize the sizes at play....
Oh...and neat thing about onshape...it's free cad that runs in your browser made by guys who split off from solidworks. It's crazy powerful and the big limit is anything you do in it is public. So here's the link if anyone wants to mess with it: https://cad.onshape.com/documents/b...3ce0781506987c1cbc/e/38a1a6301333e177140ed869 Be warned though - as I said this is a really bad design with some ugly mistakes in the sketches. I need to draw something better up tonight now that I've figured out a few more things about onshape.