I’m starting to print parts for a Truggy. I’m hoping to get a feel for what people are using for infill and material combinations.
I have a Stratasys machine so I’m stuck with either 100% infill or about 20% infill. I recently figured out how to hack the DRM on it though so I should have the ability to ABS, PET, PC, and some Nylon. (haven’t done much testing with them yet though.)
Daniel Norée stated he used 100% infill for the wishbones in this group. Not sure what was the material, but likely ABS at the time ?
Anyway, my understanding is that PLA is lacking in thermal and/or mechanical resistance for critical parts (differentials, wishbones, …). I’ve printed most of mine in ColorFabb’s PLA/PHA anyway, and will reprint when parts fail (I haven’t finished it yet, I’m slowly learning 3D printing…).
ABS was a strong contender in the early days.
Recently, there as been a lot of people praising Nylon (mostly Taulman’s) even though it is not very rigid - someone (sorry, forget who) created a two-parts differential with the inside in a rigid material (ABS?) and the outside (teeth) in Nylon.
I’ve recently bought some ColorFabb XT (the material is PETG). It prints easily, and should be more resistant than PLA in theory. I don’t remember anyone reporting results with it yet.
Hopefully people with working truggies will comment on this issue as well 
Hi, sorry for lack of updates lately.
Anyhow in the beginning when I printed the wishbones In ABS I did so with a 100% infill. Now I print them in Nylon with 30% infill.
I have just recently started to use three different materials for the diffs. ABS for the gears, Nylon for the casing and Polycarbonate for the Axle shafts. This has been the most durable combination for me so far.