105mm Micro Quad w/ CFF

thingiverse

This is a remix of the popular Micro 105 FPV quad. The goal was to widen the arms sufficiently (at least 3mm) to allow continuous strands of carbon fiber to be inserted while printing quads on my Markforged Mark Two. I also feel that it looks less toy-like than the standard frame with single arms, but that's just a matter of personal opinion. Want one printed but don't have access to a Markforged machine? Check out our page on 3Dhubs and we'll make one for you! https://www.3dhubs.com/buffalo/hubs/miller-3d I was breaking a lot of ABS frames (just learning to fly, not very good yet) so I switched to nylon. While fantastically crashproof, the nylon v3 frames were very floppy which wasn't great. My work got a Mark Two recently so I figured this would be a good chance to take advantage of its shorter CFF length compared to the Mark One. The V1 frame weighed 7.75g for top and bottom, is stiff enough (for me) and is entirely crashproof, I challenge anyone to break one of these frames. The V1 base only has fiber in the arms, it did not path to the center of the frame. It's pretty flexible but once assembled with the carbon reinforced upper deck it gains a lot of strength. I have yet to print V2/3 but it has been revised to use less nylon on the motor mounts (but requires a tiny bit of thin tape to hold them, I plan on using Kapton) and has carbon fiber pathed through the center of the bottom frame, so it should be a good bit stiffer than V1. Based on material volumes, the slicer tells me that it should weigh about 5.76g for the bottom only. I can probably cut some more weight by reducing the wall thicknesses in the middle, I had to extend them outwards to get carbon around the holes and was too lazy to thin the inside out at the moment. I just revised it again to cut some weight out of the center of the frame, v3 should now come in at about 5.1g. The top has also been modified to path fiber. V1 only puts it around the perimeter which is good enough, really. It's the 13 degree top for fast forward flight, haven't made any of the other angles. Once we get Onyx (new Markforged material, nylon with chopped fiber) I will try a print in that with continuous carbon as well, that should be plenty strong and stiff for any application. If anyone wants one of these printed and doesn't have access to a Mark Two, I can probably print some. It might be a bit more expensive than if it were my personal printer, but I'm sure I can help some people out if needed. You could probably get away with just using my lower frame with a standard ABS upper, that part doesn't really break much in the first place. I plan on printing v3 frame in the next couple days. I've extensively crashed v1 over the past few days and it's tough as nails. Update: I've printed the v3 frame with Onyx (chopped carbon in nylon) and also have CFF strands of carbon fiber in the part. It's super strong and still crashproof! Check out the photo of the bottom frame with an 8lb granite block on it, there's barely any deflection. Very impressive strength from a five gram part. The combined frame weighs 7.5g and my quad weighs 38.5g without a battery. Print Settings Printer: Markforged Mark Two Rafts: No Supports: No Resolution: .125mm (required for carbon fiber) Infill: full Notes: Printed with Markforged nylon and their Carbon CFF fiber. 4.47 cm^3 of nylon used, .11cm^3 of carbon for V2. V3 is 4.25 cm^3 nylon, .15 cm^3 carbon. Printed with four total layers of carbon, two at the top, two at the bottom. Two concentric rings. Keep thin features turned on. Onyx will work even better than straight nylon, I will try that soon, they accidentally shipped us two rolls of nylon with the printer instead of one each. How I Designed This Remixed from the v3 bottom frame stl file using Geomagic Design X.