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Hi Hubert,
Thanks for kind words and feedback.

1) What microstepping did you set by jumpers? For Z axis I would recommend something like 1/4, 1/2 or even fullstep. It will give you a bit more torque. You will have to change DEFAULT_AXIS_STEPS_PER_UNIT accordingly. (For X and Y keep 1/16 or even 1/32 for better precision)

2) what is the acceleration set in firmware? it should be really low, like
DEFAULT_MAX_ACCELERATION {150, 150, 1, 15}
where 1 is for Z axis. And set also
DEFAULT_ZJERK 0.01
to enforce acceleration whenever the axis moves.

3) lubricate the threaded rods in Z axis really well. That will increase friction and reduce torque required to move in Z. Try to move the Z axis all the way up and down few times. It will take a lot of time time, but will pay off in the future.

4) what threaded rod do you use - M5 or M8? With all this you should be able to get somewhere to 0.35mm/s in Z axis on M5. I have no personal experience with M8, but in theory it should be 2.5 times quicker.

5) also try to buy brass or nylon nuts instead of common nickel plated iron.

6) 5V motors are right choice but try to increase current in Z axis stepper driver. There are two motors so you need 0.18-0.30A in total. Vref on this driver should be 0.09-0.15V. (You can use even slightly more if motors in Z are not in break and if printer do not move in Z during retraction but only when changing layers. But check if they are not heating up too much.)

Hope that will help and please keep me posted about your progress.