This lid is specifically designed for Elegoo MercuryX curing station. Its purpose is to allow the use to fit taller objects inside the curing environment, for example I designed it specifically to get rid of uncured resin (dissolved in either ethanol or IPA) inside an Anycubic wash tank. 25mm should suffice for most uses, but I've copied in the .step file if one wishes to print an even higher lid riser.