FL say with some resins, an LT tank will only last 1 - 2 liters, but with standard resins it should last twice as long… so at best, 4 liters, but this isn’t the case with black, black resin clouds the LT tanks pretty quickly.
I’ve also had lots of trouble printing standard white with the LT tank, and it was also rippled coming out of the box.
Is the LT tank FEP film? I don’t think it is, if it were you should be able to simply replace the film, not the entire vat, as you can with recent DLP machines.
This tank was designed for printing in a high volume production environment and offers a longer tank lifetime for some Formlabs resins.
Resin Tank LT is compatible with the following materials:
Required: Grey Pro, Rigid, Elastic. New tank recommended for every 1-2 L of resin.
Recommended: Castable Wax, Denture Base, Denture Teeth.
Compatible: Standard Resins, Dental Resins, Durable, Tough, High Temp, Flexible, Castable. Offers at least two times longer lifetime than the standard resin tank when printing with these resins.
Not compatible: Ceramic.