My first attempt at building and flying the C170 resulted in failure. My tests with my BL X1C and BL PLA-Aero filament had me printing with a flow rate of ~0.4, but my parts were consistently heavier than his target weights. Not by a lot, but it adds up. In addition, the parts didn't always look that great. I'd occasionally get some see-through areas, and areas that looked like under-extrusion. Couple that with a slightly heavier electronics package (I'm using an ELRS PWM receiver), and the wrong prop (thanks Troy. You really need to fix your YouTube links!🙃), and I ended up with a 92 g. ship that was too heavy to fly.
So, I decided to start over. I made more test prints, this time slowing all the speeds to 55 mm/s (I failed to notice that his .3MF files kept the default speed settings. Doah!). I also slowed the printer down using "Silent Mode". The results look promising. With the flow rate down to 0.32, and slowing everything way down, my resulting prints are flawless. In addition, I'm seeing a weight reduction of over 12% from the target.
We'll see what the end result brings, but since my electronics (receiver, ESC, motor mount, servos, battery, velcro, everything) comes in at almost 30 grams, I'm hoping that this lighter printing, coupled with the correct propeller, will allow this bird to fly. I'm even thinking of leaving off the landing gear, since it really doesn't need it, though it might affect C.G. too much. I'm curious to know to what extent "Silent Mode" is helping here. There are varying opinions out there, but since I'm not in a hurry, I haven't made any comparison tests. All I know is, these new prints look fantastic, and they are super light.
Oh, one other thing. Most of these parts need a brim. I added an outer brim with a 0.33 brim-object gap, which made it super easy to separate.