Build Your Own SLA/SLS

Hello All,

i build Top Down DLP 3D Printer, i face a problem in Z-Axis accuracy.
The error is around 0.5 mm

i'm using ball screw in Z-axis, Resin is SPOTA.

what's the cause of this problem? what's the solution? anyone faced or read about similar problem before??

Thanks

Hint: the good dimensions measurements in XY But bad measurement(570 micron) is Z-Axis