I do like the idea of the preheat function though I think the way it was implemented is clumsy. As it is now, every time the lid is opened the resin begins to preheat. Whenever I open the lid I am not intending to print something. The problem with this method is that this also increments the resin tray count and uses more electricity needlessly. Also, I noticed that when I remove a completed part the preheating cycle starts which is undesirable. I would prefer that there is a button on the screen for preheating and that the resin tray is preheated whenever the printer is primed.