I’ve been using tough 1500 resin with a form 2. (I have only ever bought one bottle of it) The resin is about 18 months old now. I’ve been printing small pieces occasionally with it, as I’ve been developing a design that will be injection molded “in my spare time” ie very slowly. I have left the resin in the machine in the lt tank between prints (I know reading the documentation I see I shouldn’t have done that … but how would I decant it from an LT tray to pour back in later between prints?!)
I’ve had problems of prints failing, and as the first step just cleaned all the optics which were dusty and “foggy”.
I tried a print and again got a fail. I noticed that the resin is very viscous - to the extent when the tank wiper goes back and forth the resin is very very slow to flow in and cover the bottom of the tank after the wipe. (I would doubt it would do so between layers when printing). I don’t remember the resin looking this viscous before.
The machine in kept away from daylight - and in a largely dim room (a spare bedroom!).
When the resin ages (by oxidation? Outgassing?) does it become more viscous - to the point prints will necessarily fail and indeed it needs to be thrown away?
If so is there any work round, eg adding some diluent to make it runnier?
Should I simply scrap what’s in the tank, and try letting the machine fill up from the remains of what’s in the resin bottle ? Ie if the thickening is due to outgassing over 18 months, is the resin likely to have aged in the tank but won’t in the bottle ?
The formlabs data says it has a 24 month shelf life … so it feels like the resin should have life in it.
As I say - the machine is kept away from sunlight, and hasn’t been overly hot (I’m in the uk), so I can’t believe the resin has started curing in the LT tray …
Any thoughts ?