nanoDLP

for CNC yes it really useful , but for printer with one Z-axis , it is more than not necessary .
use micro-stepping and small lead in screw

I know what I talk about

backXslash nice job !

I will happy to try it at WIP version , let me know please when it possible

next time be more polite if you ask some think , I'm not your father to keep your a...
I use custom mixed resin , it's calibration for DLprinter.com 
it can't help you

Great JOB Shahin  ! 

I have couple Ideas for precise positioning UV sensor .

first
is to use small linear actuator X and Y   which hold UV sensor  and  have position holes same tray for resin  ,
when we choose frame in grid the sensor rapidly move in that  place by actuators.

second
is make stencil from any plastic or metal by laser cutting aganse with position holes same tray for resin ,
and hold UV sensor in tapered shape , which will center sensor in stencil exactly in mid of each one

this one correct !