as above, decide on a base vehicle with a drivetrain that suits your design, buy a secondhand roller and basically use the driveshafts, diffs,shocks etc. if you can use the hubs too, otherwise you will need to get them machined as printed hubs are not strong enough in experience. everything can be made, its just far more convenient and cheaper to use bought bits where you can in the longrun. took me 10+ hours to make a ball diff from scratch, takes under an hour to cad up mast parts for printing
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