Austar 313mm crawler lower link extension spacer
thingiverse
The front axle has really bad caster angle. This can easily be fixed by making the lower links a bit longer. A printed part isn't really necessary, a M4 nut will also do the trick. Just unscrew the rod ends and insert the spacer/nut. There is enough thread remaining for stability. However, do not overdo it, because you will get bad drive shaft angles otherwise.
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