You’re looking at an LT tray after about 1/2 bottle of standard Formlabs Clear Resin V2. From this usage you can see foggy spots from supports (something I thought LT was designed to reduce/eliminate), gouges in the surface (I’m guessing from the build plate driving stray chunks of failed prints into it, although the wiper is supposed to handle that*), and finally the horizontal streaks which are known to be caused by the wiper motion (I always pour resin into a new tank before installing the wiper, I never let the wiper move while dry).
The huge sharktooth-shaped item is an air bubble between the polyglass and the PDMS/FEP (?) layers above it. This apparently happened during roughly 3 months of storing resin in the tray. This is in my shop so climate control is not an issue.
So in my documented experience, The “LT” moniker refers neither to usage nor storage. What exactly is the improvement then?
- The wiper does NOT sweep the entire build area after each layer, only up to the edge of the item(s) being printed. This may save a little time per print, but it does NOT move dislocated cured chunks enough to prevent the build plate from driving them into the tray surface on subsequent passes.