warped bottom layers

[mojoman3D]

I am having a problem where the bottom layers are not staying flat to the build platform. The long sides are pulling away resulting in a convex arch. This is with the grey resin. 

Bottom Layer Count: 8
Exposure time: 12s
Bottom Exposure time: 90s
Light-off Delay: 0s
Bottom Light-off Delay: 0s

   

[VDX]

... what layer height?

You can try to sand the build platform surface to change the adhesion ...

Viktor

[mojoman3D]

... what layer height?

You can try to sand the build platform surface to change the adhesion ...

Viktor

What grit of sand paper?

[VDX]

... dunno ...