Center diff destroyed in like 5 meters running at 20% throttle max.

Center diff destroyed in like 5 meters running at 20% throttle max. Does Daniel use some kind of SuperStrong ABS. I´ll try rebuilding it with a different brand ABS.

What setup are you running?

It’s likely not the strength of the ABS, but probably your tolerances. If they don’t mesh right they’ll destroy themselves.

Looking at this it looks like your bearings have been spinning instead of being locked to the gear. Then everything spins or not spins as required.

I’m running a 4350kv sensored brushless motor, i’ve changed the settings on the esc to very soft starts and try rebuilding the center diff and keep a watch on the tolerances. I’m not giving up just jet with printed diffs, but I also ordered some cheap chinese metal diffs just in case. When I have them I’ll try and make a case for it. (at least for the center diff)

I’ve got some better results with a newly printed center diff, but this one fused together after about 15min 25% throttle , and is in full lock now. Front and rear diffs still looking good and running smooth. More testing tonight, it’s my first rc car with some real power, and it’s a blast! :slight_smile:

How about polycarbonate

@Glenn_West , check out Emile’s user page. They found an awesome solution, mixing nylon with ABS

I’ve also ordered some sample polycarbonate filament from china, I now have an all metal hotend that can reach the temps needed for it whitout melting itself. Still waiting on delivery of the filament. Curious about its strength, I find the wishbones in nylon a bit too flexible.

@Emile_Wim awaiting your comments on the polycarbonate then. Willing to share the source?
I agree on the wishbones. Although in this case since they will absorb a lot of stress when hit directly, being that flexible might prevent most of the stress moving to weaker parts of the design.

I’ve bought some test packs from ebay: 151071046927

Lulzbot.com also sells it but shipping costs almost kills it for me, I’ll test the ebay stuff first before ordering a spool from lulzbot.