Model dragging along bottom of tank

Hi. As my model is printing it drags along the bottom of the tank and snaps pieces off? is it not calibrated correctly??

grey resin

Sounds like you may need to adjust the Z-fine tuning.
Take a look here:

The problem is probably either your build is not adequately sticking to the build platform (look at z-height adjustment, scuff your build plate with 220-grit, or potentially a contaminated build plate surface) or your model has some high suction forces. Those forces could come from a lot of surface area contact (try a different model orientation) or an enclosed volume creating cupping.

Did you lower your contact point size for the supports? That can also create a pretty fragile support structure.

There are some lower probability things like expired resin, etc, but not very likely.

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