Fillamentum Nylon FX256 Natural, 1.75 mm (750 g)

Insane strength to weight

Rated with 5 out of 5 stars.

With a density of 1.01g/cm3, this stuff is my go-to filament when strength/weight is paramount.
That's marginally more than PP (~0.96g/cm3) but it's way easier to print and way more resilient, so for a given strength it's effectively lighter.
I use it for drone parts, and things that most people print in TPU (~1.25g/cm3), I print using this and can get the weight down to about half of what it would be in TPU.
When you are talking about a tiny drone whose total weight is ~15-20g, that makes a HUGE difference!
Yes, it's a bugger to print, especially for larger parts, but if you are printing small (In the order of a couple of grams) parts, then just use a decent adhesive (I use magigoo PA) and it will be fine.
For example, this tiny part (weight without support material of 0.3g) prints absolutely fine, even without a raft. https://i.imgur.com/81HHeay.png
Those overhangs are 45 degrees and the cross-section of the struts is 1.6mm square - also note the very small contact area with the bed.
This part is perfectly functional as a propeller guard, deflecting impacts with no problem.

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