Why printer works this way ?

Your first layer between 3 to 5 should be at minimum 40 seconds each. They need to be as hard as possible and cured as deep as possible to assure a good foundation to the bed.  The rest of your layers can be lower depending on the resin. As for as the projection is it actually projecting or just turning on the UV? I believe it turns on the UV a second or two before projecting a layer to allow the light to stabilize.

The calibration plate that nanoDLP has is only for cure time for the remaining layers excluding the foundation layers. If you don't mind, post the model you are trying to print. I have Wanhao Black loaded in mine right now and I could try it. I also have sanded my platform however so I have yet to have any adhesion problem.

Another issue on adhesion is orientation of the model. You want to orient on the build plat so it has a good first few layers but the the remaining layers present the smallest possible cross-section as possible. Ideally you want the base layers to be the largest cross section and the the remaining layers to be less of a cross section.

I am printing it now on my D7. i will let you know what happens.

Just for the record I use build 1827 for nanoDLP and the Creative Workshop to orient and setup the model that was made for the D7 with the corrected settings on the wiki.

If you have nanoDLP integrated then it will also slice the model based on it's settings when you add it as a plate. Unless you are printing straight from CW. I log into nanoDLP through my web browser  and use it to control the printer. The only thing I do with CW is orient the model, add a base or supports, then save it to an STL so that I can load that STL into nanoDLP as a plate. I have the 1.4 model that does not have an LCD display.

If you don't use nanodlp then you won't know what a plate is. So never mind. I will say that nanoDLP gives you much more control of the printer than the settings in CW do. You can even set the time it waits between movement of the platform. But I guess it boils down to whatever you learn to use the printer with, it tends to stick with you. The 1.4 does not have an internal controller or SDcard capability so that would be my reason for using nanoDLP.

I am 37mm of 57mm and so far it is still printing fine.

My cure time 22 seconds for four bottom layers and 6 seconds for each layer afterwards.

I am going to bed for now as it will not be done until an estimated 23:14 my time which it is now 22:27 and I don't stay up that late before a work day. I'll let you know how it did an d take a picture when I get home tomorrow.

I used the CW from the wiki that is preset for the D7. It has boxes X and Y under image reflection checked. That may solve your orientation issue.

Are you setting CW to add a base to the model for adhesion? If so you need to have the model sunk into it by a few layers and then when the print is complete an cured you will have to cut and sand it down.

Or you need to print the model directly to the platform with build platform with no adhesion aids.

It looks like your print is separating after the base is printed. This leads me to think you raised your model x height and then created a base with same X height.

In your CW screen shot your curing times are way off. Your bottom exposure is set for 4000 ms that is only 4 seconds. It should be around 20 seconds or so which would be 20000. Your exposure time for other layers is also wrong. You have it set to 10 that is not seconds, but ms. So you are only curing for .01 seconds on your other layers. If you want 10 seconds then it needs to be set to 10000. Remember the setting is expecting ms as in microseconds not seconds. So you have to multiple times 1000 for seconds.

In summary bottom layers need long exposure of around 20 seconds or 20000 ms.
Other layers need exposure time of around 6 seconds or 6000 ms.

Your model in question should take around 3+ hours to complete.

Thanks for the try.

I need some clarification on slicer settings.
Lift and Sequence Time (ms) [Auto Calc]
That value stands for time it takes for platform to lift and lower or not just that ?

My confusion here is that when exposure time is 8000 and bottom layers are 30000, what would be good lift&sequence timing and why?
And why changing exposure time effects sequence time. How are they connected ?

Also i dont see any change when i play with:
Z Lift speed
Z Bottom Speed (what is that ?)
Z Retract Speed (what is that ?)

I cant leave settings alone.
When i do dry print (no vat) to observe how what setting effects the print, i am confused about the need for sequencing.
Why doesn't it just print one layer at the time ? Why does there have to be some timing involved between layers ?

What i mean is:
Why wont it submerge the build plate
wait exposure time
Lift
Repeat
Seems to me 3 simple steps, yet its so complicated to figure it out.
Who ever designed this had smoked pot too much i think because from what i understand, its not writing the code with "one step at the time" method, but rather "depending on how long steps take".

That creates a ton of problems.
Sequencing is now required to be calculated based on the machine because each machine takes its own time to move up/down depending on the speed.
I am also not sure why speed values seem to be ignored. Perhaps i didnt crank them up high enough ?