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Is the chassis made of a car tire?
I like the alternative material choices, but you might need to pour some epoxy over the loose component wires to hold everything firmly in place, or it may shake 'n' break apart.
Nope, it's plywood, sprayed black and lacquered. A car tyre would make an… 'interesting'… chassis!
Yep, I've had to repair a few breaks already, I will probably set the circuit when I've got the brain made, and confirmed that the driver works alright. Part of the reason I'm taking a 'real modular' approach is so that I can swap out this motor driver with another one (I have some SOIC HIP4081s ready) in the future, without changing any programming.
That's my favorite approach and it's very easy to trouble shoot too - but you could still do that on PCB (which is quite easy to make at home, as long as you don't need super thin traces).