@o_lampe hugely thank you so much!
that worked...i was just confused regarding the 3.3 v pin because on the TB6600 there is only 5v pin but somehow that worked without any problems; tbh that mini breakout board is the real lifesaver.

Is it possible that i can remap the z axis to External stepper driver (in my case TB6600) without actully using the expansion board because i pretty much don't seem to have a need of other things of duex board like more integrated drivers,thermistors,heater outputs etc.
for ex: i can use the pins 5, 7, 9, 11 to connect the TB6600?

Thank you for your help in advance