Im using uni mould, can i de mould before post cure or do i have to keep the part in?

It's always better to keep the part in the mould as it helps prevent print-through and distortion. But it's possible and sometimes unavoidable to post-cure after demoulding, it just needs to be done carefully and ramp the heat up as slowly as possible. 

Ok, i think im going to have to de mould first but it's not an important part really, just a cover.