A tray for storing Elegoo Mars 4 9K or Mars 4 Ultra 9K resin tanks. Heavily inspired by a Elegoo MARS 3 tank stand I used to use, but created from the ground up.
It should keep the film protected well enough while the tank is off the printer. For example, I got myself an extra resin tank for my Mars 4 Ultra 9K, to easily switch between ACF and FEP.
The design has a lot of flat surface, so adjust the ironing settings to your preferences.