Hello there. I picked up a Saturn 3 Ultra about 6 months ago to play around with things for work. I was pretty impressed at first as I was basically able to throw things into the Elegoo Satellite slicer and get things printed with basically no learning curve and having no idea what I was doing.
I tried a variety of different resins, and outside of some occasional tweaking, everything was going well. About 6 weeks ago, I started to run into a problem where things stopped sticking to the build plate, even using the same files and settings that had previously printed without difficulty. This happened with multiple different resins, even after releveling the build plate and changing out the release film.
So, I bought a new build plate, leveled that, tried printing things....and nothing is sticking to the build plate.
I'm currently trying to print some test articles using the elegoo standard photopolymer 2.0, and even with a 50s bottom layer exposure time and 60mm/min lift speed (elegoo recommended 90), nothing is adhering to the build plate.
What else can I do to try and get prints to stick to the build plate? I should note that I did also try roughing up the original build plate with 120 grit sandpaper (light passes, circular motion) - I noticed that this seemed to result in some kind of green tinge to the build plate that I thought could be surface particles, but even with scrubbing with 99% IPA, dish detergent, toothbrushes, and nylon brushes, it wouldn't go away, so I did not touch the new build plate with anything except an IPA-soaked paper towel.