Looks like it's a good thing I used the silicone on the bottom sheet, the PLA got proper stuck to the top glass, and wasn't coming off with a putty knife. I'm putting it in the freezer for a bit to try and release it, but for my next experiment, I'll likely need to use silicone on the top sheet too. I think I may want to try and cast my own form in silicone so I can get more consistent results, but don't want to commit to buying a casting set :/
Yours truly,
Ayydan
Ayydan