i created a simple chess set.
printed with 100% speed till upper fine parts,then lowered to 50%.
printed all in one batch, time: 4:45.
still some stringing and z-layer issues.
king (right) height 65mm
I find that beautiful
thanks.
here a rendered preview.
Some nice printed parts! 
To counteract the small Z banding in the parts you can try to mount the bottom of the Z motor to the frame.
different print speed generates more or less oozing (only left, right is allready cleaned).
here the stringing issue, happens while traveling to the next figur.
regarding the z-axis issue i will go for a better solution like this
with a proper coupling this should work fine.
Have you tried to play with the Retraction parameters (e.g. increase Length value) to reduce the “stringing issue” between the figures?
not at the moment, just happens when printing several figures, travel to the next does not retract with print speed 50%.
HI. Are you using Repetier and Slic3r for Slicing?
If yes, how can you change the speed for different layers?
the different layerheigth can be choosen in the slic3r plater, generate the G-code from there.