How much can the filiment used in printing lowrider parts effect the rigidity?

[vicious1 (Ryan)]

@Setlab

Would standard run of the mill PLA create a lowrider cnc machine that is just as rigid as say one printed in PETG?

You have that opposite, PLA is much more rigid, it is pretty much the most rigid filament currently available. PETG is good if there are higher temps than 55C involved.